Method for configuring signal field in wireless communication system

ABSTRACT

An embodiment of the present invention relates to a technique for configuring a signal field in a wireless communication system. A receiving STA may receive and decode a PPDU. The PPDU may include a control information field, a plurality of signal fields, and a plurality of data fields. The control information field may be duplicated based on a first bandwidth, and the plurality of signal fields may be duplicated based on a second bandwidth. The second bandwidth may be set to be larger than the first bandwidth.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

The present specification relates to a method for configuring a signalfield and transmitting and receiving the signal field in variouswireless communication systems including a wireless LAN system.

Related Art

A wireless local area network (WLAN) has been enhanced in various ways.For example, the IEEE 802.11ax standard has proposed an enhancedcommunication environment by using orthogonal frequency divisionmultiple access (OFDMA) and downlink multi-user multiple input multipleoutput (DL MU MIMO) schemes.

The present specification proposes a technical feature that can beutilized in a new communication standard. For example, the newcommunication standard may be an extreme high throughput (EHT) standardwhich is currently being discussed. The EHT standard may use anincreased bandwidth, an enhanced PHY layer protocol data unit (PPDU)structure, an enhanced sequence, a hybrid automatic repeat request(HARQ) scheme, or the like, which is newly proposed. The EHT standardmay be called the IEEE 802.11be standard.

In addition, in a wireless local area network (WLAN), a method forconfiguring a frame has been improved in various ways. For example, inthe conventional standard, a control field is configured based on anumber of channels or frequency bands.

SUMMARY OF THE DISCLOSURE Technical Objects

In order to provide a data rate that is higher than the 802.11axstandard, signal transmission using a wide bandwidth (e.g., a bandwidthof 320 MHz or wider) is being considered in the EHT standard. Whenperforming signal transmission using a wide bandwidth, the same methodas the conventional (or existing) standard (e.g., HE-SIG-B transmissionmethod of the 802.11ax standard) may be used. However, in this case, aproblem of increase in signal overhead may occur. Therefore, in case oftransmitting a signal by using a wide bandwidth, a method foreffectively notifying related information to STAs may be required.

Therefore, in embodiments according to the present specification, incase of transmitting signals to a plurality of STAs by using a widebandwidth, a method for efficiently transmitting allocated STA controlinformation to corresponding STAs may be proposed.

Technical Solutions

The present specification relates to a method being performed by areceiving station (STA) of a Wireless Local Area Network (WLAN) system.

The receiving STA according to an example of the present specificationmay receive a Physical layer Protocol Data Unit (PPDU) including acontrol information field, a plurality of Signal fields, and a pluralityof Data fields.

The control information field according to an example of the presentspecification may include control information for interpreting the PPDU.

One control information field according to an example of the presentspecification may have a first bandwidth.

Within the PPDU, the control information field according to an exampleof the present specification may be duplicated based on the firstbandwidth.

The plurality of Signal fields according to an example of the presentspecification may include a first Signal field and a second Signalfield.

Each of the first Signal field and the second Signal field according toan example of the present specification may have a second bandwidth.

Each of the first Signal field and the second Signal field according toan example of the present specification may be duplicated based on thesecond bandwidth.

The second bandwidth according to an example of the presentspecification may be configured to be wider than the first bandwidth.

The receiving STA according to an example of the present specificationmay decode at least one of the plurality of Data fields, based on atleast one of the first Signal field and the second Signal field.

EFFECTS OF THE DISCLOSURE

The present specification proposes technical features of transmittingsignals through a wide bandwidth in various WLAN systems (e.g., IEEE802.11be system). Based on various examples of the presentspecification, a signal field (e.g., SIG-B) is configured in the widebandwidth, and the configured signal field may be transmitted orreceived.

Additionally, according to various examples of the presentspecification, a signal field may be transmitted through a largerfrequency unit, and signal overhead may be reduced by performingtransmission after duplicating the signal field within a designatedfrequency range.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an example of a transmitting apparatus and/or receivingapparatus of the present specification.

FIG. 2 is a conceptual view illustrating the structure of a wirelesslocal area network (WLAN).

FIG. 3 illustrates a general link setup process.

FIG. 4 illustrates an example of a PPDU used in an IEEE standard.

FIG. 5 illustrates a layout of resource units (RUs) used in a band of 20MHz.

FIG. 6 illustrates a layout of RUs used in a band of 40 MHz.

FIG. 7 illustrates a layout of RUs used in a band of 80 MHz.

FIG. 8 illustrates a structure of an HE-SIG-B field.

FIG. 9 illustrates an example in which a plurality of user STAs areallocated to the same RU through a MU-MIMO scheme.

FIG. 10 illustrates an operation based on UL-MU.

FIG. 11 illustrates an example of a trigger frame.

FIG. 12 illustrates an example of a common information field of atrigger frame.

FIG. 13 illustrates an example of a subfield included in a per userinformation field.

FIG. 14 describes a technical feature of the UORA scheme.

FIG. 15 illustrates an example of a channel used/supported/definedwithin a 2.4 GHz band.

FIG. 16 illustrates an example of a channel used/supported/definedwithin a 5 GHz band.

FIG. 17 illustrates an example of a channel used/supported/definedwithin a 6 GHz band.

FIG. 18 illustrates an example of a PPDU being used in the presentspecification.

FIG. 19 illustrates an example of an HE-SIG-B content channel beingconfigured at 80 MHz.

FIG. 20 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 21 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 22 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 240 MHz.

FIG. 23 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 24 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 25 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 240 MHz.

FIG. 26 to FIG. 30 respectively illustrate an SIGB content channelconfiguration when performing PPDU transmission through40/80/160/240/320 MHz.

FIG. 31 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 32 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

FIG. 33 is a flowchart for describing exemplary operations of atransmitting STA.

FIG. 34 is a flowchart for describing exemplary operations of areceiving STA.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

As used herein, a slash (/) or comma may indicate “and/or.” For example,“A/B” may indicate “A and/or B,” and therefore may mean “only A,” “onlyB,” or “A and B.” Technical features that are separately described inone drawing may be implemented separately or may be implementedsimultaneously.

As used herein, parentheses may indicate “for example.” Specifically,“control information (EHT-Signal)” may mean that “EHT-Signal” isproposed as an example of “control information.” Further, “controlinformation (i.e., EHT-Signal)” may also mean that “EHT-Signal” isproposed as an example of “control information.”

The following example of the present specification can be applied tovarious wireless communication systems. For example, the followingexample of the present specification may be applied to a wireless localarea network (WLAN) system. For example, the present specification maybe applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11axstandard. In addition, the present specification can be applied to thenewly proposed EHT standard or IEEE 802.11be standard. In addition, anexample of the present specification may be applied to the EHT standardor a new wireless LAN standard that is enhanced with IEEE 802.11be. Inaddition, an example of the present specification may be applied to amobile communication system. For example, it may be applied to a mobilecommunication system based on LTE (Long Term Evolution) based on 3rdGeneration Partnership Project (3GPP) standard and its evolution. Inaddition, an example of the present specification may be applied to acommunication system of 5G NR standard based on 3GPP standard.

Hereinafter, in order to describe a technical feature of the presentspecification, a technical feature applicable to the presentspecification will be described.

FIG. 1 shows an example of a transmitting apparatus and/or receivingapparatus of the present specification.

In the example of FIG. 1 , various technical features described belowmay be performed. FIG. 1 relates to two stations (STAs). For example,STAs (110, 120) of the present specification may also be called invarious terms such as a mobile terminal, a wireless device, a wirelesstransmit/receive unit (WTRU), a user equipment (UE), a mobile station(MS), a mobile subscriber unit, or simply a user. The STAs (110, 120) ofthe present specification may also be called in various terms such as anetwork, a base station, a node-B, an access point (AP), a repeater, arouter, a relay, or the like. The STAs (110, 120) of the presentspecification may also be referred to as various names such as areceiving apparatus, a transmitting apparatus, a receiving STA, atransmitting STA, a receiving device, a transmitting device, or thelike.

For example, the STAs (110, 120) may serve as an AP or a non-AP. Thatis, the STAs (110, 120) of the present specification may serve as the APand/or the non-AP.

The STAs (110, 120) of the present specification may support variouscommunication standards together in addition to the IEEE 802.11standard. For example, a communication standard (e.g., LTE, LTE-A, 5G NRstandard) or the like based on the 3GPP standard may be supported. Inaddition, the STA of the present specification may be implemented asvarious devices such as a mobile phone, a vehicle, a personal computer,or the like. In addition, the STA of the present specification maysupport communication for various communication services such as voicecalls, video calls, data communication, and self-driving(autonomous-driving), or the like.

The STAs (110, 120) of the present specification may include a mediumaccess control (MAC) conforming to the IEEE 802.11 standard and aphysical layer interface for a radio medium.

The first STA (110) may include a processor (111), a memory (112), and atransceiver (113). The illustrated process, memory, and transceiver maybe implemented individually as separate chips, or at least twoblocks/functions may be implemented through a single chip.

The transceiver (113) of the first STA performs a signaltransmission/reception operation. Specifically, an IEEE 802.11 packet(e.g., IEEE 802.11a/b/g/n/ac/ax/be, and so on) may betransmitted/received.

For example, the first STA (110) may perform an operation intended by anAP. For example, the processor (111) of the AP may receive a signalthrough the transceiver (113), process a reception (RX) signal, generatea transmission (TX) signal, and provide control for signal transmission.The memory (112) of the AP may store a signal (e.g., RX signal) receivedthrough the transceiver (113), and may store a signal (e.g., TX signal)to be transmitted through the transceiver.

For example, the second STA (120) may perform an operation intended by anon-AP STA. For example, a transceiver (123) of a non-AP performs asignal transmission/reception operation. Specifically, an IEEE 802.11packet (e.g., IEEE 802.11a/b/g/n/ac/ax/be packet, and so on) may betransmitted/received.

For example, a processor (121) of the non-AP STA may receive a signalthrough the transceiver (123), process an RX signal, generate a TXsignal, and provide control for signal transmission. A memory (122) ofthe non-AP STA may store a signal (e.g., RX signal) received through thetransceiver (123), and may store a signal (e.g., TX signal) to betransmitted through the transceiver.

For example, an operation of a device indicated as an AP in thespecification described below may be performed in the first STA (110) orthe second STA (120). For example, if the first STA (110) is the AP, theoperation of the device indicated as the AP may be controlled by theprocessor (111) of the first STA (110), and a related signal may betransmitted or received through the transceiver (113) controlled by theprocessor (111) of the first STA (110). In addition, control informationrelated to the operation of the AP or a TX/RX signal of the AP may bestored in the memory (112) of the first STA (110). In addition, if thesecond STA (120) is the AP, the operation of the device indicated as theAP may be controlled by the processor (121) of the second STA (120), anda related signal may be transmitted or received through the transceiver(123) controlled by the processor (121) of the second STA (120). Inaddition, control information related to the operation of the AP or aTX/RX signal of the AP may be stored in the memory (122) of the secondSTA (120).

For example, in the specification described below, an operation of adevice indicated as a non-AP (or user-STA) may be performed in the firstSTA (110) or the second STA (120). For example, if the second STA (120)is the non-AP, the operation of the device indicated as the non-AP maybe controlled by the processor (121) of the second STA (120), and arelated signal may be transmitted or received through the transceiver(123) controlled by the processor (121) of the second STA (120). Inaddition, control information related to the operation of the non-AP ora TX/RX signal of the non-AP may be stored in the memory (122) of thesecond STA (120). For example, if the first STA (110) is the non-AP, theoperation of the device indicated as the non-AP may be controlled by theprocessor (111) of the first STA (110), and a related signal may betransmitted or received through the transceiver (113) controlled by theprocessor (111) of the first STA (110). In addition, control informationrelated to the operation of the non-AP or a TX/RX signal of the non-APmay be stored in the memory (112) of the first STA (110).

In the specification described below, a device called a(transmitting/receiving) STA, a first STA, a second STA, an STA1, anSTA2, an AP, a first AP, a second AP, an AP1, an AP2, a(transmitting/receiving) terminal, a (transmitting/receiving) device, a(transmitting/receiving) apparatus, a network, or the like may imply theSTAs (110, 120) of FIG. 1 . For example, a device indicated as, withouta specific reference numeral, the (transmitting/receiving) STA, thefirst STA, the second STA, the STA1, the STA2, the AP, the first AP, thesecond AP, the AP1, the AP2, the (transmitting/receiving) terminal, the(transmitting/receiving) device, the (transmitting/receiving) apparatus,the network, or the like may imply the STAs (110, 120) of FIG. 1 . Forexample, in the following example, an operation in which various STAstransmit/receive a signal (e.g., a PPDU) may be performed in thetransceivers (113, 123) of FIG. 1 . In addition, in the followingexample, an operation in which various STAs generate a TX/RX signal orperform data processing and computation in advance for the TX/RX signalmay be performed in the processors (111, 121) of FIG. 1 . For example,an example of an operation for generating the TX/RX signal or performingthe data processing and computation in advance may include: 1) anoperation ofdetermining/obtaining/configuring/computing/decoding/encoding bitinformation of a sub-field (SIG, STF, LTF, Data) included in a PPDU; 2)an operation of determining/configuring/obtaining a time resource orfrequency resource (e.g., a subcarrier resource) or the like used forthe sub-field (SIG, STF, LTF, Data) included the PPDU; 3) an operationof determining/configuring/obtaining a specific sequence (e.g., a pilotsequence, an STF/LTF sequence, an extra sequence applied to SIG) or thelike used for the sub-field (SIG, STF, LTF, Data) field included in thePPDU; 4) a power control operation and/or power saving operation appliedfor the STA; and 5) an operation related todetermining/obtaining/configuring/decoding/encoding or the like of anACK signal. In addition, in the following example, a variety ofinformation used by various STAs fordetermining/obtaining/configuring/computing/decoding/decoding a TX/RXsignal (e.g., information related to a field/subfield/controlfield/parameter/power or the like) may be stored in the memories (112,122) of FIG. 1 .

FIG. 2 is a conceptual view illustrating the structure of a wirelesslocal area network (WLAN).

An upper part of FIG. 2 illustrates the structure of an infrastructurebasic service set (BSS) of institute of electrical and electronicengineers (IEEE) 802.11.

Referring the upper part of FIG. 2 , the wireless LAN system may includeone or more infrastructure BSSs (200, 205) (hereinafter, referred to asBSS). The BSSs (200, 205) as a set of an AP and an STA such as an accesspoint (AP) (225) and a station (STA1) (200-1) which are successfullysynchronized to communicate with each other are not concepts indicatinga specific region. The BSS (205) may include one or more STAs (205-1,205-2) which may be joined to one AP (230).

The BSS may include at least one STA, APs providing a distributionservice, and a distribution system (DS) (210) connecting multiple APs.

The distribution system (210) may implement an extended service set(ESS) (240) extended by connecting the multiple BSSs (200, 205). The ESS(240) may be used as a term indicating one network configured byconnecting one or more APs through the distribution system (210). The APincluded in one ESS (240) may have the same service set identification(SSID).

A portal (220) may serve as a bridge which connects the wireless LANnetwork (IEEE 802.11) and another network (e.g., 802.X).

In the BSS illustrated in the upper part of FIG. 2 , a network betweenthe APs (225, 230) and a network between the APs (225, 230) and the STAs(200-1, 205-1, 205-2) may be implemented. However, the network isconfigured even between the STAs without the APs (225, 230) to performcommunication. A network in which the communication is performed byconfiguring the network even between the STAs without the APs (225, 230)is defined as an Ad-Hoc network or an independent basic service set(IBSS).

A lower part of FIG. 2 illustrates a conceptual view illustrating theIBSS.

Referring to the lower part of FIG. 2 , the IBSS is a BSS that operatesin an Ad-Hoc mode. Since the IBSS does not include the access point(AP), a centralized management entity that performs a managementfunction at the center does not exist. That is, in the IBSS, STAs(250-1, 250-2, 250-3, 255-4, 255-5) are managed by a distributed manner.In the IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) may beconstituted by movable STAs and are not permitted to access the DS toconstitute a self-contained network.

FIG. 3 illustrates a general link setup process.

In step S310, a STA may perform a network discovery operation. Thenetwork discovery operation may include a scanning operation of the STA.That is, to access a network, the STA needs to discover a participatingnetwork. The STA needs to identify a compatible network beforeparticipating in a wireless network, and a process of identifying anetwork present in a particular area is referred to as scanning.Scanning methods include active scanning and passive scanning.

FIG. 3 illustrates a network discovery operation including an activescanning process. In active scanning, a STA performing scanningtransmits a probe request frame and waits for a response to the proberequest frame in order to identify which AP is present around whilemoving to channels. A responder transmits a probe response frame as aresponse to the probe request frame to the STA having transmitted theprobe request frame. Here, the responder may be a STA that transmits thelast beacon frame in a BSS of a channel being scanned. In the BSS, sincean AP transmits a beacon frame, the AP is the responder. In an IBSS,since STAs in the IBSS transmit a beacon frame in turns, the responderis not fixed. For example, when the STA transmits a probe request framevia channel 1 and receives a probe response frame via channel 1, the STAmay store BSS-related information included in the received proberesponse frame, may move to the next channel (e.g., channel 2), and mayperform scanning (e.g., transmits a probe request and receives a proberesponse via channel 2) by the same method.

Although not shown in FIG. 3 , scanning may be performed by a passivescanning method. In passive scanning, a STA performing scanning may waitfor a beacon frame while moving to channels. A beacon frame is one ofmanagement frames in IEEE 802.11 and is periodically transmitted toindicate the presence of a wireless network and to enable the STAperforming scanning to find the wireless network and to participate inthe wireless network. In a BSS, an AP serves to periodically transmit abeacon frame. In an IBSS, STAs in the IBSS transmit a beacon frame inturns. Upon receiving the beacon frame, the STA performing scanningstores information about a BSS included in the beacon frame and recordsbeacon frame information in each channel while moving to anotherchannel. The STA having received the beacon frame may store BSS-relatedinformation included in the received beacon frame, may move to the nextchannel, and may perform scanning in the next channel by the samemethod.

After discovering the network, the STA may perform an authenticationprocess in step S320. The authentication process may be referred to as afirst authentication process to be clearly distinguished from thefollowing security setup operation in step S340. The authenticationprocess in step S320 may include a process in which the STA transmits anauthentication request frame to the AP and the AP transmits anauthentication response frame to the STA in response. The authenticationframes used for an authentication request/response are managementframes.

The authentication frames may include information about anauthentication algorithm number, an authentication transaction sequencenumber, a status code, a challenge text, a robust security network(RSN), and a finite cyclic group.

The STA may transmit the authentication request frame to the AP. The APmay determine whether to allow the authentication of the STA based onthe information included in the received authentication request frame.The AP may provide the authentication processing result to the STA viathe authentication response frame.

When the STA is successfully authenticated, the STA may perform anassociation process in step S330. The association process includes aprocess in which the STA transmits an association request frame to theAP and the AP transmits an association response frame to the STA inresponse. The association request frame may include, for example,information about various capabilities, a beacon listen interval, aservice set identifier (SSID), a supported rate, a supported channel,RSN, a mobility domain, a supported operating class, a trafficindication map (TIM) broadcast request, and an interworking servicecapability. The association response frame may include, for example,information about various capabilities, a status code, an association ID(AID), a supported rate, an enhanced distributed channel access (EDCA)parameter set, a received channel power indicator (RCPI), a receivedsignal-to-noise indicator (RSNI), a mobility domain, a timeout interval(association comeback time), an overlapping BSS scanning parameter, aTIM broadcast response, and a QoS map.

In step S340, the STA may perform a security setup process. The securitysetup process in step S340 may include a process of setting up a privatekey through four-way handshaking, for example, through an extensibleauthentication protocol over LAN (EAPOL) frame.

FIG. 4 illustrates an example of a PPDU used in an IEEE standard.

As illustrated in FIG. 4 , various types of PHY protocol data units(PPDUs) are used in IEEE a/g/n/ac standards. Specifically, a LTF and aSTF include a training signal, a SIG-A and a SIG-B include controlinformation for a receiving STA, and a data field includes user datacorresponding to a PSDU (MAC PDU/aggregated MAC PDU).

FIG. 4 also includes an example of an HE PPDU according to IEEE802.11ax. The HE PPDU according to FIG. 4 is an illustrative PPDU formultiple users. A HE-SIG-B may be included only in a PPDU for multipleusers, and an HE-SIG-B may be omitted in a PPDU for a single user.

As illustrated in FIG. 4 , the HE-PPDU for multiple users (MUs) mayinclude a legacy-short training field (L-STF), a legacy-long trainingfield (L-LTF), a legacy-signal (L-SIG), a high efficiency-signal A(HE-SIG A), a high efficiency-signal-B (HE-SIG B), a highefficiency-short training field (HE-STF), a high efficiency-longtraining field (HE-LTF), a data field (alternatively, an MAC payload),and a packet extension (PE) field. The respective fields may betransmitted for illustrated time periods (i.e., 4 or 8 µs).

Hereinafter, a resource unit (RU) used for a PPDU is described. An RUmay include a plurality of subcarriers (or tones). An RU may be used totransmit a signal to a plurality of STAs according to OFDMA. Further, anRU may also be defined to transmit a signal to one STA. An RU may beused for an STF, an LTF, a data field, or the like.

FIG. 5 illustrates a layout of resource units (RUs) used in a band of 20MHz.

As illustrated in FIG. 5 , resource units (RUs) corresponding todifferent numbers of tones (i.e., subcarriers) may be used to form somefields of an HE-PPDU. For example, resources may be allocated inillustrated RUs for a HE-STF, a HE-LTF, and a data field.

As illustrated in the uppermost part of FIG. 5 , a 26-unit (i.e., a unitcorresponding to 26 tones) may be disposed. Six tones may be used for aguard band in the leftmost band of the 20 MHz band, and five tones maybe used for a guard band in the rightmost band of the 20 MHz band.Further, seven DC tones may be inserted in a center band, that is, a DCband, and a 26-unit corresponding to 13 tones on each of the left andright sides of the DC band may be disposed. A 26-unit, a 52-unit, and a106-unit may be allocated to other bands. Each unit may be allocated fora receiving STA, that is, a user.

The layout of the RUs in FIG. 5 may be used not only for a multiple-user(MU) but also for a single user (SU), in which case one 242-unit may beused and three DC tones may be inserted as illustrated in the lowermostpart of FIG. 5 .

Although FIG. 5 proposes RUs having various sizes, that is, a 26-RU, a52-RU, a 106-RU, and a 242-RU, specific sizes of RUs may be extended orincreased. Therefore, the present embodiment is not limited to thespecific size of each RU (i.e., the number of corresponding tones).

FIG. 6 illustrates a layout of RUs used in a band of 40 MHz.

Similarly to FIG. 5 in which RUs having various sizes are used, a 26-RU,a 52-RU, a 106-RU, a 242-RU, a 484-RU, and the like may be used in anexample of FIG. 6 . Further, five DC tones may be inserted in a centerfrequency, 12 tones may be used for a guard band in the leftmost band ofthe 40 MHz band, and 11 tones may be used for a guard band in therightmost band of the 40 MHz band.

As illustrated in FIG. 6 , when the layout of the RUs is used for asingle user, a 484-RU may be used. The specific number of RUs may bechanged similarly to FIG. 5 .

FIG. 7 illustrates a layout of RUs used in a band of 80 MHz.

Similarly to FIG. 5 and FIG. 6 in which RUs having various sizes areused, a 26-RU, a 52-RU, a 106-RU, a 242-RU, a 484-RU, a 996-RU, and thelike may be used in an example of FIG. 7 . Further, seven DC tones maybe inserted in the center frequency, 12 tones may be used for a guardband in the leftmost band of the 80 MHz band, and 11 tones may be usedfor a guard band in the rightmost band of the 80 MHz band. In addition,a 26-RU corresponding to 13 tones on each of the left and right sides ofthe DC band may be used.

As illustrated in FIG. 7 , when the layout of the RUs is used for asingle user, a 996-RU may be used, in which case five DC tones may beinserted.

In the meantime, the fact that the specific number of RUs can be changedis the same as the examples of FIGS. 5 and 6 .

The RU arrangement/allocation (i.e., RU location) shown in FIGS. 5 to 7can be applied to a new wireless LAN system (e.g., EHT system) as it is.Meanwhile, in the 160 MHz band supported by the new WLAN system, the RUarrangement/allocation for 80 MHz (that is, the example of FIG. 7 ) isrepeated twice, or the RU arrangement for the 40 MHz (i.e., the exampleof FIG. 6 ) is repeated 4 times. In addition, when the EHT PPDU isconfigured in the 320 MHz band, the arrangement/allocation of the RU for80 MHz (i.e., example of FIG. 7 ) may be repeated 4 times or thearrangement of the RU for 40 MHz (i.e., example of FIG. 6 ) may berepeated 8 times.

One RU of the present specification may be allocated for only one STA(e.g., non-AP). Alternatively, a plurality of RUs may be allocated forone STA (e.g., non-AP).

The RU described in the present specification may be used in uplink (UL)communication and downlink (DL) communication. For example, when UL-MUcommunication which is solicited by a trigger frame is performed, atransmitting STA (e.g., AP) may allocate a first RU (e.g.,26/52/106/242-RU, and so on) to a first STA through the trigger frame,and may allocate a second RU (e.g., 26/52/106/242-RU, and so on) to asecond STA. Thereafter, the first STA may transmit a first trigger-basedPPDU based on the first RU, and the second STA may transmit a secondtrigger-based PPDU based on the second RU. The first/secondtrigger-based PPDU is transmitted to the AP at the same (or overlapped)time period.

For example, when a DL MU PPDU is configured, the transmitting STA(e.g., AP) may allocate the first RU (e.g., 26/52/106/242-RU, and so on)to the first STA, and may allocate the second RU (e.g.,26/52/106/242-RU, and so on) to the second STA. That is, thetransmitting STA (e.g., AP) may transmit HE-STF, HE-LTF, and Data fieldsfor the first STA through the first RU in one MU PPDU, and may transmitHE-STF, HE-LTF, and Data fields for the second STA through the secondRU.

Information related to a layout of the RU may be signaled throughHE-SIG-B.

FIG. 8 illustrates a structure of an HE-SIG-B field.

As illustrated, a HE-SIG-B field (810) includes a common field (820) anda user-specific field (830). The common field (820) may includeinformation commonly applied to all users (i.e., user STAs) whichreceive SIG-B. The user-specific field (830) may be called auser-specific control field. When the SIG-B is transferred to aplurality of users, the user-specific field (830) may be applied onlyany one of the plurality of users.

As illustrated in FIG. 8 , the common field (820) and the user-specificfield (830) may be separately encoded.

The common field (820) may include RU allocation information of N*8bits. For example, the RU allocation information may include informationrelated to a location of an RU. For example, when a 20 MHz channel isused as shown in FIG. 5 , the RU allocation information may includeinformation related to a specific frequency band to which a specific RU(26-RU/52-RU/106-RU) is arranged.

An example of a case in which the RU allocation information consists of8 bits is as follows.

TABLE 1 8 bits indices (B7 B6 B5 B4 B3 B2 B1 B0) #1 #2 #3 #4 #5 #6 #7 #8#9 Number of entries 00000000 26 26 26 26 26 26 26 26 26 1 00000001 2626 26 26 26 26 26 52 1 00000010 26 26 26 26 26 52 26 26 1 00000011 26 2626 26 26 52 52 1 00000100 26 26 52 26 26 26 26 26 1 00000101 26 26 52 2626 26 52 1 00000110 26 26 52 26 52 26 26 1 00000111 26 26 52 26 52 52 100001000 52 26 26 26 26 26 26 26 1

As shown the example of FIG. 5 , up to nine 26-RUs may be allocated tothe 20 MHz channel. When the RU allocation information of the commonfield 820 is set to “00000000” as shown in Table 1, the nine 26-RUs maybe allocated to a corresponding channel (i.e., 20 MHz). In addition,when the RU allocation information of the common field (820) is set to“00000001” as shown in Table 1, seven 26-RUs and one 52-RU are arrangedin a corresponding channel. That is, in the example of FIG. 5 , the52-RU may be allocated to the rightmost side, and the seven 26-RUs maybe allocated to the left thereof.

The example of Table 1 shows only some of RU locations capable ofdisplaying the RU allocation information.

For example, the RU allocation information may include an example ofTable 2 below.

TABLE 2 8 bits indices (B7 B6 B5 B4 B3 B2 B1 B0) #1 #2 #3 #4 #5 #6 #7 #8#9 Number of entries 01000y₂y₁y₀ 106 26 26 26 26 26 8 01001y₂y₁y₀ 106 2626 26 52 8

“01000y2y1y0” relates to an example in which a 106-RU is allocated tothe leftmost side of the 20 MHz channel, and five 26-RUs are allocatedto the right side thereof. In this case, a plurality of STAs (e.g.,user-STAs) may be allocated to the 106-RU, based on a MU-MIMO scheme.Specifically, up to 8 STAs (e.g., user-STAs) may be allocated to the106-RU, and the number of STAs (e.g., user-STAs) allocated to the 106-RUis determined based on 3-bit information (y2y1y0). For example, when the3-bit information (y2y1y0) is set to N, the number of STAs (e.g.,user-STAs) allocated to the 106-RU based on the MU-MIMO scheme may beN+1.

In general, a plurality of STAs (e.g., user STAs) different from eachother may be allocated to a plurality of RUs. However, the plurality ofSTAs (e.g., user STAs) may be allocated to one or more RUs having atleast a specific size (e.g., 106 subcarriers), based on the MU-MIMOscheme.

As shown in FIG. 8 , the user-specific field (830) may include aplurality of user fields. As described above, the number of STAs (e.g.,user STAs) allocated to a specific channel may be determined based onthe RU allocation information of the common field (820). For example,when the RU allocation information of the common field (820) is“00000000”, one user STA may be allocated to each of nine 26-RUs (e.g.,nine user STAs may be allocated). That is, up to 9 user STAs may beallocated to a specific channel through an OFDMA scheme. In other words,up to 9 user STAs may be allocated to a specific channel through anon-MU-MIMO scheme.

For example, when RU allocation is set to “01000y2y1y0”, a plurality ofSTAs may be allocated to the 106-RU arranged at the leftmost sidethrough the MU-MIMO scheme, and five user STAs may be allocated to five26-RUs arranged to the right side thereof through the non-MU MIMOscheme. This case is specified through an example of FIG. 9 .

FIG. 9 illustrates an example in which a plurality of user STAs areallocated to the same RU through a MU-MIMO scheme.

For example, when RU allocation is set to “01000010” as shown in FIG. 9, a 106-RU may be allocated to the leftmost side of a specific channel,and five 26-RUs may be allocated to the right side thereof. In addition,three user STAs may be allocated to the 106-RU through the MU-MIMOscheme. As a result, since eight user STAs are allocated, theuser-specific field (830) of HE-SIG-B may include eight user fields.

The eight user fields may be expressed in the order shown in FIG. 9 . Inaddition, as shown in FIG. 8 , two user fields may be implemented withone user block field.

The user fields shown in FIG. 8 and FIG. 9 may be configured based ontwo formats. That is, a user field related to a MU-MIMO scheme may beconfigured in a first format, and a user field related to a non-MIMOscheme may be configured in a second format. Referring to the example ofFIG. 9 , a user field 1 to a user field 3 may be based on the firstformat, and a user field 4 to a user field 8 may be based on the secondformat. The first format or the second format may include bitinformation of the same length (e.g., 21 bits).

Each user field may have the same size (e.g., 21 bits). For example, theuser field of the first format (the first of the MU-MIMO scheme) may beconfigured as follows.

For example, a first bit (i.e., B0-B10) in the user field (i.e., 21bits) may include identification information (e.g., STA-ID, partial AID,and so on) of a user STA to which a corresponding user field isallocated. In addition, a second bit (i.e., B11-B14) in the user field(i.e., 21 bits) may include information related to a spatialconfiguration. Specifically, an example of the second bit (i.e.,B11-B14) may be as shown in Table 3 and Table 4 below.

TABLE 3 N_(user) B3...B0 N_(STS) [1] N_(STS) [2] N_(STS) [3] N_(STS) [4]N_(STS) [5] N_(STS) [6] N_(STS) [7] N_(STS) [8] Total N_(STS) Number Iof entries 2 0000-0011 1-4 1 2-5 10 0100-0110 2-4 2 4-6 0111-1000 3-4 36-7 1001 4 4 8 3 0000-0011 1-4 1 1 3-6 13 0100-0110 2-4 2 1 5-70111-1000 3-4 3 1 7-8 1001-1011 2-4 2 2 6-8 1100 3 3 2 8 4 0000-0011 1-41 1 1 4-7 11 0100-0110 2-4 2 1 1 6-8 0111 3 3 1 1 8 1000-1001 2-3 2 2 17-8 1010 2 2 2 2 8

TABLE 4 N_(user) B3...B0 N_(STS) [1] N_(STS) [2] N_(STS) [3] N_(STS) [4]N_(STS) [5] N_(STS) [6] N_(STS) [7] N_(STS) [8] Total N_(STS) Number ofentries 5 0000-0011 1-4 1 1 1 1 5-8 7 0100-0101 2-3 2 1 1 1 7-8 0110 2 22 1 1 8 6 0000-0010 1-3 1 1 1 1 1 6-8 4 0011 2 2 1 1 1 1 8 7 0000-00011-2 1 1 1 1 1 1 7-8 2 8 0000 1 1 1 1 1 1 1 8 1

As shown in Table 3 and/or Table 4, the second bit (e.g., B11-B14) mayinclude information related to the number of spatial streams allocatedto the plurality of user STAs which are allocated based on the MU-MIMOscheme. For example, when three user STAs are allocated to the 106-RUbased on the MU-MIMO scheme as shown in FIG. 9 , N_user is set to “3”.Therefore, values of N_STS[1], N_STS[2], and N_STS[3] may be determinedas shown in Table 3. For example, when a values of the second bit(B11-B14) is “0011”, it may be set to N_STS[1]=4, N_STS[2]=1,N_STS[3]=1. That is, in the example of FIG. 9 , four spatial streams maybe allocated to the user field 1, one spatial stream may be allocated tothe user field 1, and one spatial stream may be allocated to the userfield 3.

As shown in the example of Table 3 and/or Table 4, information (i.e.,the second bit, B11-B14) related to the number of spatial streams forthe user STA may consist of 4 bits. In addition, the information (i.e.,the second bit, B11-B14) on the number of spatial streams for the userSTA may support up to eight spatial streams. In addition, theinformation (i.e., the second bit, B11-B14) on the number of spatialstreams for the user STA may support up to four spatial streams for oneuser STA.

In addition, a third bit (i.e., B15-18) in the user field (i.e., 21bits) may include modulation and coding scheme (MCS) information. TheMCS information may be applied to a data field in a PPDU includingcorresponding SIG-B.

An MCS, MCS information, an MCS index, an MCS field, or the like used inthe present specification may be indicated by an index value. Forexample, the MCS information may be indicated by an index 0 to an index11. The MCS information may include information related to aconstellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM,256-QAM, 1024-QAM, and so on) and information related to a coding rate(e.g., ½, ⅔, ¾, ⅚e, and so on). Information related to a channel codingtype (e.g., LCC or LDPC) may be excluded in the MCS information.

In addition, a fourth bit (i.e., B19) in the user field (i.e., 21 bits)may be a reserved field.

In addition, a fifth bit (i.e., B20) in the user field (i.e., 21 bits)may include information related to a coding type (e.g., BCC or LDPC).That is, the fifth bit (i.e., B20) may include information related to atype (e.g., BCC or LDPC) of channel coding applied to the data field inthe PPDU including the corresponding SIG-B.

The aforementioned example relates to the user field of the first format(the format of the MU-MIMO scheme). An example of the user field of thesecond format (the format of the non-MU-MIMO scheme) is as follows.

A first bit (e.g., B0-B10) in the user field of the second format mayinclude identification information of a user STA. In addition, a secondbit (e.g., B11-B13) in the user field of the second format may includeinformation related to the number of spatial streams applied to acorresponding RU. In addition, a third bit (e.g., B14) in the user fieldof the second format may include information related to whether abeamforming steering matrix is applied. A fourth bit (e.g., B15-B18) inthe user field of the second format may include modulation and codingscheme (MCS) information. In addition, a fifth bit (e.g., B19) in theuser field of the second format may include information related towhether dual carrier modulation (DCM) is applied. In addition, a sixthbit (i.e., B20) in the user field of the second format may includeinformation related to a coding type (e.g., BCC or LDPC).

FIG. 10 illustrates an operation based on UL-MU. As illustrated, atransmitting STA (e.g., AP) may perform channel access throughcontending (e.g., a backoff operation), and may transmit a trigger frame(1030). That is, the transmitting STA may transmit a PPDU including thetrigger frame (1030). Upon receiving the PPDU including the triggerframe, a trigger-based (TB) PPDU is transmitted after a delaycorresponding to SIFS.

TB PPDUs (1041, 1042) may be transmitted at the same time period, andmay be transmitted from a plurality of STAs (e.g., user STAs) havingAIDs indicated in the trigger frame (1030). An ACK frame (1050) for theTB PPDU may be implemented in various forms.

A specific feature of the trigger frame is described with reference toFIG. 11 to FIG. 13 . Even if UL-MU communication is used, an orthogonalfrequency division multiple access (OFDMA) scheme or a MU MIMO schememay be used, and the OFDMA and MU-MIMO schemes may be simultaneouslyused.

FIG. 11 illustrates an example of a trigger frame. The trigger frame ofFIG. 11 allocates a resource for uplink multiple-user (MU) transmission,and may be transmitted, for example, from an AP. The trigger frame maybe configured of a MAC frame, and may be included in a PPDU.

Each field shown in FIG. 11 may be partially omitted, and another fieldmay be added. In addition, a length of each field may be changed to bedifferent from that shown in the drawing.

A frame control field (1110) of FIG. 11 may include information relatedto a MAC protocol version and extra additional control information. Aduration field (1120) may include time information for NAV configurationor information related to an identifier (e.g., AID) of an STA.

In addition, an RA field (1130) may include address information of areceiving STA of a corresponding trigger frame, and may be optionallyomitted. A TA field (1140) may include address information of an STA(e.g., AP) which transmits the corresponding trigger frame. A commoninformation field (1150) includes common control information applied tothe receiving STA which receives the corresponding trigger frame. Forexample, a field indicating a length of an L-SIG field of an uplink PPDUtransmitted in response to the corresponding trigger frame orinformation for controlling content of an SIG-A field (i.e., HE-SIG-Afield) of the uplink PPDU transmitted in response to the correspondingtrigger frame may be included. In addition, as common controlinformation, information related to a length of a CP of the uplink PPDUtransmitted in response to the corresponding trigger frame orinformation related to a length of an LTF field may be included.

In addition, per user information fields (1160#1 to 1160#N)corresponding to the number of receiving STAs which receive the triggerframe of FIG. 11 are preferably included. The per user information fieldmay also be called an “allocation field”.

In addition, the trigger frame of FIG. 11 may include a padding field(1170) and a frame check sequence field (1180).

Each of the per user information fields (1160#1 to 1160#N) shown in FIG.11 may include a plurality of subfields.

FIG. 12 illustrates an example of a common information field of atrigger frame. A subfield of FIG. 12 may be partially omitted, and anextra subfield may be added. In addition, a length of each subfieldillustrated may be changed.

A length field (1210) illustrated has the same value as a length fieldof an L-SIG field of an uplink PPDU transmitted in response to acorresponding trigger frame, and a length field of the L-SIG field ofthe uplink PPDU indicates a length of the uplink PPDU. As a result, thelength field (1210) of the trigger frame may be used to indicate thelength of the corresponding uplink PPDU.

In addition, a cascade identifier field (1220) indicates whether acascade operation is performed. The cascade operation implies thatdownlink MU transmission and uplink MU transmission are performedtogether in the same TXOP. That is, it implies that downlink MUtransmission is performed and thereafter uplink MU transmission isperformed after a pre-set time (e.g., SIFS). During the cascadeoperation, only one transmitting device (e.g., AP) may perform downlinkcommunication, and a plurality of transmitting devices (e.g., non-APs)may perform uplink communication.

A CS request field (1230) indicates whether a wireless medium state oran NAV or the like is necessarily considered in a situation where areceiving device which has received a corresponding trigger frametransmits a corresponding uplink PPDU.

A HE-SIG-A information field (1240) may include information forcontrolling content of an SIG-A field (i.e., HE-SIG-A field) of theuplink PPDU in response to the corresponding trigger frame.

A CP and LTF type field (1250) may include information related to a CPlength and LTF length of the uplink PPDU transmitted in response to thecorresponding trigger frame. A trigger type field (1260) may indicate apurpose of using the corresponding trigger frame, for example, typicaltriggering, triggering for beamforming, a request for block ACK/NACK, orthe like.

It may be assumed that the trigger type field (1260) of the triggerframe in the present specification indicates a trigger frame of a basictype for typical triggering. For example, the trigger frame of the basictype may be referred to as a basic trigger frame.

FIG. 13 illustrates an example of a subfield included in a per userinformation field. A user information field (1300) of FIG. 13 may beunderstood as any one of the per user information fields (1160#1 to1160#N) mentioned above with reference to FIG. 11 . A subfield includedin the user information field (1300) of FIG. 13 may be partiallyomitted, and an extra subfield may be added. In addition, a length ofeach subfield illustrated may be changed.

A user identifier field (1310) of FIG. 13 indicates an identifier of anSTA (i.e., receiving STA) corresponding to per user information. Anexample of the identifier may be the entirety or part of an associationidentifier (AID) value of the receiving STA.

In addition, an RU allocation field (1320) may be included. That is,when the receiving STA identified through the user identifier field(1310) transmits a TB PPDU in response to the trigger frame, the TB PPDUis transmitted through an RU indicated by the RU allocation field(1320). In this case, the RU indicated by the RU allocation field (1320)may be an RU shown in FIG. 5 , FIG. 6 , and FIG. 7 .

The subfield of FIG. 13 may include a coding type field (1330). Thecoding type field (1330) may indicate a coding type of the TB PPDU. Forexample, when BCC coding is applied to the TB PPDU, the coding typefield (1330) may be set to ‘1’, and when LDPC coding is applied, thecoding type field (1330) may be set to ‘0’.

In addition, the subfield of FIG. 13 may include an MCS field (1340).The MCS field (1340) may indicate an MCS scheme applied to the TB PPDU.For example, when BCC coding is applied to the TB PPDU, the coding typefield (1330) may be set to ‘1’, and when LDPC coding is applied, thecoding type field (1330) may be set to ‘0’.

Hereinafter, a UL OFDMA-based random access (UORA) scheme will bedescribed.

FIG. 14 describes a technical feature of the UORA scheme.

A transmitting STA (e.g., AP) may allocate six RU resources through atrigger frame as shown in FIG. 14 . Specifically, the AP may allocate a1st RU resource (AID 0, RU 1), a 2nd RU resource (AID 0, RU 2), a 3rd RUresource (AID 0, RU 3), a 4th RU resource (AID 2045, RU 4), a 5th RUresource (AID 2045, RU 5), and a 6th RU resource (AID 3, RU 6).Information related to the AID 0, AID 3, or AID 2045 may be included,for example, in the user identifier field (1310) of FIG. 13 .Information related to the RU 1 to RU 6 may be included, for example, inthe RU allocation field (1320) of FIG. 13 . AID=0 may imply a UORAresource for an associated STA, and AID=2045 may imply a UORA resourcefor a non-associated STA. Accordingly, the 1st to 3rd RU resources ofFIG. 14 may be used as a UORA resource for the associated STA, the 4thand 5th RU resources of FIG. 14 may be used as a UORA resource for thenon-associated STA, and the 6th RU resource of FIG. 14 may be used as atypical resource for UL MU.

In the example of FIG. 14 , an OFDMA random access backoff (OBO) of anSTA1 is decreased to 0, and the STA1 randomly selects the 2nd RUresource (AID 0, RU 2). In addition, since an OBO counter of an STA⅔ isgreater than 0, an uplink resource is not allocated to the STA⅔. Inaddition, regarding an STA4 in FIG. 14 , since an AID (e.g., AID=3) ofthe STA4 is included in a trigger frame, a resource of the RU 6 isallocated without backoff.

Specifically, since the STA1 of FIG. 14 is an associated STA, the totalnumber of eligible RA RUs for the STA1 is 3 (RU 1, RU 2, and RU 3), andthus the STA1 decreases an OBO counter by 3 so that the OBO counterbecomes 0. In addition, since the STA2 of FIG. 14 is an associated STA,the total number of eligible RA RUs for the STA2 is 3 (RU 1, RU 2, andRU 3), and thus the STA2 decreases the OBO counter by 3 but the OBOcounter is greater than 0. In addition, since the STA3 of FIG. 14 is anon-associated STA, the total number of eligible RA RUs for the STA3 is2 (RU 4, RU 5), and thus the STA3 decreases the OBO counter by 2 but theOBO counter is greater than 0.

FIG. 15 illustrates an example of a channel used/supported/definedwithin a 2.4 GHz band.

The 2.4 GHz band may be called in other terms such as a first band. Inaddition, the 2.4 GHz band may imply a frequency domain in whichchannels of which a center frequency is close to 2.4 GHz (e.g., channelsof which a center frequency is located within 2.4 to 2.5 GHz) areused/supported/defined.

A plurality of 20 MHz channels may be included in the 2.4 GHz band. 20MHz within the 2.4 GHz may have a plurality of channel indices (e.g., anindex 1 to an index 14). For example, a center frequency of a 20 MHzchannel to which a channel index 1 is allocated may be 2.412 GHz, acenter frequency of a 20 MHz channel to which a channel index 2 isallocated may be 2.417 GHz, and a center frequency of a 20 MHz channelto which a channel index N is allocated may be (2.407 + 0.005*N) GHz.The channel index may be called in various terms such as a channelnumber or the like. Specific numerical values of the channel index andcenter frequency may be changed.

FIG. 15 exemplifies 4 channels within a 2.4 GHz band. Each of 1st to 4thfrequency domains (1510 to 1540) shown herein may include one channel.For example, the 1st frequency domain (1510) may include a channel 1 (a20 MHz channel having an index 1). In this case, a center frequency ofthe channel 1 may be set to 2412 MHz. The 2nd frequency domain (1520)may include a channel 6. In this case, a center frequency of the channel6 may be set to 2437 MHz. The 3rd frequency domain (1530) may include achannel 11. In this case, a center frequency of the channel 11 may beset to 2462 MHz. The 4th frequency domain (1540) may include a channel14. In this case, a center frequency of the channel 14 may be set to2484 MHz.

FIG. 16 illustrates an example of a channel used/supported/definedwithin a 5 GHz band.

The 5 GHz band may be called in other terms such as a second band or thelike. The 5 GHz band may imply a frequency domain in which channels ofwhich a center frequency is greater than or equal to 5 GHz and less than6 GHz (or less than 5.9 GHz) are used/supported/defined. Alternatively,the 5 GHz band may include a plurality of channels between 4.5 GHz and5.5 GHz. A specific numerical value shown in FIG. 16 may be changed.

A plurality of channels within the 5 GHz band include an unlicensednational information infrastructure (UNII)-1, a UNII-2, a UNII-3, and anISM. The INII-1 may be called UNII Low. The UNII-2 may include afrequency domain called UNII Mid and UNII-2Extended. The UNII-3 may becalled UNII-Upper.

A plurality of channels may be configured within the 5 GHz band, and abandwidth of each channel may be variously set to, for example, 20 MHz,40 MHz, 80 MHz, 160 MHz, or the like. For example, 5170 MHz to 5330 MHzfrequency domains/ranges within the UNII-1 and UNII-2 may be dividedinto eight 20 MHz channels. The 5170 MHz to 5330 MHz frequencydomains/ranges may be divided into four channels through a 40 MHzfrequency domain. The 5170 MHz to 5330 MHz frequency domains/ranges maybe divided into two channels through an 80 MHz frequency domain.Alternatively, the 5170 MHz to 5330 MHz frequency domains/ranges may bedivided into one channel through a 160 MHz frequency domain.

FIG. 17 illustrates an example of a channel used/supported/definedwithin a 6 GHz band.

The 6 GHz band may be called in other terms such as a third band or thelike. The 6 GHz band may imply a frequency domain in which channels ofwhich a center frequency is greater than or equal to 5.9 GHz areused/supported/defined. A specific numerical value shown in FIG. 17 maybe changed.

For example, the 20 MHz channel of FIG. 17 may be defined starting from5.940 GHz. Specifically, among 20 MHz channels of FIG. 17 , the leftmostchannel may have an index 1 (or a channel index, a channel number, andso on), and 5.945 GHz may be assigned as a center frequency. That is, acenter frequency of a channel of an index N may be determined as(5.940 + 0.005*N)GHz.

Accordingly, an index (or channel number) of the 2 MHz channel of FIG.17 may be 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61,65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125,129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 169, 173, 177, 181,185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 233. Inaddition, according to the aforementioned (5.940 + 0.005*N)GHz rule, anindex of the 40 MHz channel of FIG. 17 may be 3, 11, 19, 27, 35, 43, 51,59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171,179, 187, 195, 203, 211, 219, 227.

Although 20, 40, 80, and 160 MHz channels are illustrated in the exampleof FIG. 17 , a 240 MHz channel or a 320 MHz channel may be additionallyadded.

Hereinafter, a PPDU transmitted/received in an STA of the presentspecification will be described.

FIG. 18 illustrates an example of a PPDU being used in the presentspecification.

The PPDU of FIG. 18 may be referred to as various terms, such as EHTPPDU, transmitting PPDU, receiving PPDU, first type or N^(th) type PPDU,and so on. Additionally, the PPDU of FIG. 18 may be used in an EHTsystem and/or a new WLAN system, which is an enhanced version of the EHTsystem.

Subfields of FIG. 18 may be changed to various terms. For example, anSIG A field may be referred to as an EHT-SIG-A field, an SIG B field maybe referred to as an EHT-SIG-B field, and STF field may be referred toas an EHT-STF field, an LTF field may be referred to as an EHT-LTFfield, and so on.

Subcarrier spacing of the L-LTF, L-STF, L-SIG, and RL-SIG fields of FIG.18 may be determined as 312.5 kHz, and subcarrier spacing of the STF,LTF, Data fields may be determined as 78.125 kHz. That is, subcarrierindexes of the L-LTF, L-STF, L-SIG, and RL-SIG fields may be indicatedin 312.5 kHz units, and subcarrier indexes of the STF, LTF, and Datafields may be indicated in 78.125 kHz units.

The SIG A field and/or SIG B field of FIG. 18 may include additionalfields (e.g., SIG C or one control symbol, and so on). In the SIG Afield and SIG B field, all/part of the subcarrier spacing may bedetermined as 312.5 kHz, and the remaining part of the subcarrierspacing may be determined as 78.125 kHz.

In the PPDU of FIG. 18 , L-LTF and L-STF may be the same as the fieldsof the related art.

The L-SIG field of FIG. 18 may, for example, include 24 bits of bitinformation. For example, the 24-bit information may include a 4-bitRate field, 1 Reserved bit, a 12-bit Length field, 1 Parity bit, and 6Tail bits. For example, the 12-bit Length field may include informationrelated to a number of octets in a Physical Service Data Unit (PSDU).For example, a value of the 12-bit Length field may be determined basedon a type of the PPDU. For example, in case the PPDU is a non-HT PPDU,an HT PPDU, a VHT PPDU, or an EHT PPDU, the value of the Length fieldmay be determined as a multiple of 3. For example, in case the PPDU isan HE PPDU, the value of the Length field may be determined as “amultiple of 3 + 1” or “a multiple of 3 + 2”. In other words, a value ofthe Length field for a non-HT PPDU, an HT PPDU, a VHT PPDU, or an EHTPPDU may be determined as a multiple of 3, and a value of the Lengthfield for an HE PPDU may be determined as “a multiple of 3 + 1” or “amultiple of 3 + 2”.

For example, a transmitting STA may apply BCC encoding, which is basedon a ½-code rate for 24-bit information of the L-SIG field. Afterwards,the transmitting STA may obtain 48 bits of BCC encoding bits. Then, BPSKmodulation may be applied to the 48 encoding bits so as to generate 48BPSK symbols. The transmitting STA may map the 48 BPSK symbols topositions excluding a pilot subcarrier{ Subcarrier indexes -21, -7, +7,+21} and a DC subcarrier{Subcarrier index 0}. As a result, the 48 BPSKsymbols may be mapped to subcarrier indexes -26 to -22, -20 to -8, -6 to-1, +1 to +6, +8 to +20, and +22 to +26. The transmitting STA mayadditionally map a signal of {-1, -1, -1, 1} to subcarrier indexes {-28,-27, +27, +28}. The aforementioned signal may be used for channelestimation for a frequency domain corresponding to {-28, -27, +27, +28}.

The transmitting STA may generate an RL-SIG, which is generatedidentically as the L-SIG. The receiving STA may know that the receptionPPDU is an HE PPDU or EHT PPDU based on the presence (or existence) ofan RL-SIG.

After the RL-SIG of FIG. 18 , for example, an EHT-SIG-A or one controlsymbol may be inserted. A symbol (i.e., EHT-SIG-A or one control symbol)that is contiguous to RL-SIG may include 26-bit information and mayinclude information for identifying an EHT PPDU type. For example, incase the EHT PPDU is sorted to various types (e.g., various types, suchas EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to aTrigger Frame, EHT PPDU related to Extended Range transmission, and soon), information on the EHT PPDU type may be included in a symbol thatis contiguous to the RL-SIG.

A symbol that is contiguous to the RL-SIG, for example, may includeinformation on a TXOP length, and information on a BSS color ID. Forexample, an SIG-A field may be configured so as to be contiguous to thesymbol (e.g., one control symbol) that is contiguous to the RL-SIG.Alternatively, a symbol that is contiguous to the RL-SIG may be an SIG-Afield.

For example, the SIG-A field may include information on 1) a DL/ULindicator, 2) a BSS color field, which is an identifier of the BSS, 3) afield including information related to remaining time of a current TXOPduration, 4) a bandwidth field including information related tobandwidth, 5) a field including information related to MCS being appliedto SIG-B, 6) an indication field including information related towhether or not a dual subcarrier modulation scheme is being applied toSIG-B, 7) a field including information related to a number of symbolsbeing used for SIG-B, 8) a field including information related towhether or not SIG-B is generated throughout the full bandwidth, 9) afield including information related to an LTF/STF type, and10) a fieldindicating LTF length and CP length.

The SIG-B of FIG. 18 may directly include the technical features of theHE-SIG-B indicated in FIG. 8 to FIG. 9 without modification.

STF of FIG. 18 may be used for enhancing automatic gain controlestimation in a multiple input multiple output (MIMO) environment orOFDMA environment. And, LTF of FIG. 18 may be used for estimating achannel in a MIMO environment or OFDMA environment.

The STF of FIG. 18 may be configured as various types STF. For example,among the STFs, a first type (i.e., 1x STF) may be generated based on afirst type STF sequence, wherein non-zero coefficients are positioned at16 subcarrier spacings. An STF signal that is generated based on thefirst type STF sequence may have a cycle of 0.8 µs. And, a 0.8 µs-cyclesignal is repeated 5 times so as to configure a first type STF having alength of 4 µs. For example, among the STFs, a second type (i.e., 2xSTF) may be generated based on a second STF sequence, wherein non-zerocoefficients are positioned at 8 subcarrier spacings. An STF signal thatis generated based on the second type STF sequence may have a cycle of1.6 µs. And, a 1.6 µs-cycle signal is repeated 5 times so as toconfigure a first type STF having a length of 8 µs. For example, amongthe STFs, a third type (i.e., 4x STF) may be generated based on a thirdSTF sequence, wherein non-zero coefficients are positioned at 4subcarrier spacings. An STF signal that is generated based on the thirdtype STF sequence may have a cycle of 3.2 µs. And, a 3.2 µs-cycle signalis repeated 5 times so as to configure a first type STF having a lengthof 16 µs. Among the above-described first to third type EHT-STFsequences, only part may be used. Additionally, an EHT-LTF field mayhave first, second, and third types (i.e., 1x, 2x, 4x LTF). For example,first/second/third type LTF field may be generated based on an LTFsequence having non-zero coefficients positioned at 4/2/1 subcarrierspacings. The first/second/third type LTF may respectively have a timelength of 3.2/6.4/12.8 µs. Additionally, various lengths of GI (e.g.,0.8/1/6/3.2 µs) may be applied to the first/second/third type LTF.

Information related to the STF and/or LTF type (also includinginformation related to GI being applied to LTF) may be included in theSIG A field and/or SIG B field, and so on, of FIG. 18 .

The PPDU of FIG. 18 may support various bandwidths. For example, thePPDU of FIG. 18 may have bandwidths of 20/40/80/160/240/320 MHz. Forexample, part of the fields of FIG. 18 (e.g., STF, LTF, or Data) may beconfigured based on the RU, which is shown in FIG. 5 to FIG. 7 , and soon. For example, in case there is one receiving STA of the PPDU of FIG.18 , all fields of the PPDU of FIG. 18 may occupy the whole bandwidth.For example, in case there are multiple receiving STA of the PPDU ofFIG. 18 (in case MU PPDU is used), part of the fields of FIG. 18 (e.g.,STF, LTF, or Data) may be configured based on the RU, which is shown inFIG. 5 to FIG. 7 , and so on. For example, STF, LTF, and Data field fora first receiving STA of the PPDU may be transmitted and receivedthrough a first RU, and STF, LTF, and Data field for a second receivingSTA of the PPDU may be transmitted and received through a second RU. Inthis case, positions of the first/second RUs may be determined based onFIG. 5 to FIG. 7 , and so on.

The PPDU of FIG. 18 may be determined (or identified) as an EHT PPDUbased on the following method.

A receiving STA may determine the type of a reception PPDU as an EHTPPDU based on the following. For example, the reception PPDU may bedetermined as an EHT PPDU, 1) in case a first symbol following an L-LTFsignal of the reception PPDU is BPSK, 2) in case an RL-SIG having theL-SIG of the reception PPDU is repeated therein is detected, and 3) incase a result of applying “modulo 3” for a Length value of the L-SIG ofthe reception PPDU is detected as “0”. In case the reception PPDU isdetermined as an EHT PPDU, the receiving STA may detect the type of theEHT PPDU (e.g., SU/MU/Trigger-based/Extended Range type) based on thebit information being included in a symbol that follows the RL-SIG ofFIG. 18 . In other words, the receiving STA may determine the receptionPPDU as an EHT PPDU based on 1) a first symbol following the L-LTFsignal, wherein the first symbol is BPSK, 2) an RL-SIG being contiguousto the L-SIG field and being identical to the L-SIG, and 3) an L-SIGincluding a Length field having the result of applying “modulo 3” set to“0”.

For example, the receiving STA may determine the type of a receptionPPDU as an HE PPDU based on the following. For example, the receptionPPDU may be determined as an HE PPDU, 1) in case a first symbolfollowing an L-LTF signal is BPSK, 2) in case an RL-SIG having the L-SIGis repeated therein is detected, and 3) in case a result of applying“modulo 3” for a Length value of the L-SIG is detected as “1” or “2”.

For example, the receiving STA may determine the type of a receptionPPDU as non-HT, HT, and VHT PPDU based on the following. For example,the reception PPDU may be determined as non-HT, HT, and VHT PPDU, 1) incase a first symbol following an L-LTF signal is BPSK, 2) in case anRL-SIG having the L-SIG is repeated therein is not detected, and 3) incase a result of applying “modulo 3” for a Length value of the L-SIG isdetected as “0”.

In the following example, a signal being indicated as a(transmission/reception) signal, a (transmission/reception) frame, a(transmission/reception) packet, a (transmission/reception) data unit,(transmission/reception) data, and so on, may be a signal beingtransmitted/received based on the PPDU of FIG. 18 . The PPDU of FIG. 18may be used for transmitting/receiving various types of frames. Forexample, the PPDU of FIG. 18 may be used for a control frame. Examplesof the control frame may include request to send (RTS), clear to send(CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, Null DataPacket (NDP) announcement, and Trigger frames. For example, the PPDU ofFIG. 18 may be used for a management frame. Examples of the managementframe may include a Beacon frame, a/an (Re-)Association Request frame,a/an (Re-)Association Response frame, a Probe Request frame, and a ProbeResponse frame. For example, the PPDU of FIG. 18 may be used for a dataframe. For example, the PPDU of FIG. 18 may be used for simultaneouslytransmitting at least two or more of the control frame, the managementframe, and the data frame.

FIG. 19 illustrates an example of an HE-SIG-B content channel beingconfigured at 80 MHz.

Referring to FIG. 19 , an example of the present specification maypropose an example of independently configuring lower two 20 MHzchannels and higher two 20 MHz channels. More specifically, proposedherein may be an example of configuring a HE-SIG-B corresponding to thehigher or lower two 20 MHz channels and duplicating the HE-SIG-B so asto use the duplicated for the remaining two 20 MHz channels.

In case the four 20 MHz channels shown in the example of FIG. 19 aresorted as a first channel to a fourth channel starting from the lowestchannel, the second channel and the fourth channel may be referred to asHE-SIG-B content channel 1. Additionally, the first channel and thethird channel may be referred to as HE-SIG-B content channel 2. Contentsof the HE-SIG-B included in the first channel may be the same ascontents of the HE-SIG-B included in the third channel. And, contents ofthe HE-SIG-B included in the second channel may be the same as contentsof the HE-SIG-B included in the fourth channel. In other words, contentsof the SIG-B included in the first and second channels may be the sameas contents of the SIG-B included in the third and fourth channels.

Hereinafter, in the present specification, exemplary embodiments ofconfiguring an SIG-B content channel may be described.

A Beyond 11ax standard (e.g., 802.11be standard (i.e., EHT standard))may transmit a signal by using a wide bandwidth (e.g., 240/320 MHz). Incase of transmitting a signal by using a wide bandwidth, a user controlfield (e.g., User field), which is configured for transmittinginformation on STA, may be configured by various methods and may, then,be transmitted. Therefore, a method of configuring a user control fieldmay hereinafter be described.

In an embodiment of the present specification, the receiving STA mayreceive a Physical layer Protocol Data Unit (PPDU) including a controlinformation field, a plurality of Signal field, and a plurality of Datafields. The control information field may include control informationinterpreting the PPDU. One control information field may have a firstbandwidth. For example, a first bandwidth may be configured as one of20, 40, 80, 160, 240, or 320 MHz.

The control information field within the PPDU may be duplicated based onthe first bandwidth. The control information field may include an SIG-Afield. More specifically, the control information field may beduplicated on units of the first bandwidth. For example, the PPDU may betransmitted through 240 MHz, and the first bandwidth may be configuredas 20 MHz. At this point, the control information field of the PPDU maybe duplicated on 20 MHz units.

The plurality of Signal fields may include a first Signal field and asecond Signal field. The plurality of Signal fields may include an SIG-Bfield. Each of the first Signal field and the second Signal field mayhave a second bandwidth. For example, a second bandwidth may beconfigured as one of 20, 40, 80, 160, 240, or 320 MHz. Each of the firstSignal field and the second Signal field may be duplicated based on thesecond bandwidth. The second bandwidth may be configured to be widerthan the first bandwidth. For example, the PPDU may be transmittedthrough 240 MHz, and the first bandwidth may be configured as 20 MHz,and the second bandwidth may be configured as 40 MHz. The first Signalfield may be duplicated on 40 MHz units. The second Signal field may beduplicated on 40 MHz units.

The plurality of Data fields may include a plurality of odd-numbereddata fields being received through a plurality of odd-numbered datasubchannels and a plurality of even-numbered data fields being receivedthrough a plurality of even-numbered data subchannels. The bandwidth ofthe plurality of odd-numbered data subchannels may be configured to beidentical as or different from the bandwidth through which the firstSignal field is received. And, the bandwidth of the plurality ofeven-numbered data subchannels may be configured to be identical as ordifferent from the bandwidth through which the second Signal field isreceived.

The receiving STA may decode at least one of the plurality of Datafields based on at least one of the first Signal field and the secondSignal field. More specifically, the first Signal field may be used fordecoding the plurality of odd-numbered data fields. And, the secondSignal field may be used for decoding the plurality of even-numbereddata fields.

Hereinafter, the first Signal field may be referred to as SIGB 1. And,the second Signal field may be referred to as SIGB 2. Additionally, achannel through which the plurality of Signal fields are being receivedmay be referred to as an SIGB content channel (or SIGB channel).

In the embodiments of the present specification, a user field includinginformation related to the STA may be referred to as SIGB. An SIGB maybe transmitted to another STA. In addition to SIGB, the user field mayalso be referred to by various other terms. For example, the user fieldmay also be referred to SIG-B, a plurality of Signal fields, and so on.

An SIGB for wide bandwidth transmission may be variously configured.Detailed configurations of the SIGB may hereinafter be described.

1. First Embodiment - Method for Transmitting an SIGB, After NewlyConfiguring an SIGB for 240 or 320 MHz

A. A SIGB for 20, 40, 80, or 160 MHz may be configured in 20 MHz unitsjust as the conventional (or existing) 802.11ax standard. The SIGB maybe transmitted by using two SIGB Content Channels.

B. In case of transmitting a signal through 240 or 320 MHz, in order toreduce overhead, the SIGB may be configured in 40 MHz or 80 MHz channelunits.

B-i) In Case the SIGB Is Configured in 40 MHz Units (or Channel Units)

In case an SIGB including User information is configured in 40 MHzunits, an SIGB Content Channel for 240 MHz or 320 MHz transmission maybe variously configured.

B-i)-a In Case Two SIGB Content Channels (or SIGB Channels) AreConfigured

An SIGB may be independently configured in 40 MHz units at 80 MHz.Additionally, the SIGB may be duplicated on 80 MHz units. For example,when performing SIGB transmission (or when performing PPDU transmission)through 240 MHz, the SIGB may be configured as [1 2 1 2 1 2] and thentransmitted. When performing transmission at 320 MHz, the SIGB may beconfigured as [12 12 12 12 ] and then transmitted. That is, the SIGB maybe configured by using a method of repeating SIGB 1 and SIGB 2.

For example, when performing transmission at 240 MHz, the SIGB ContentChannel 1 may be configured to include information on an STA beingallocated to first, third, and/or fifth 40 MHz channels within 240 MHz.And, the SIGB Content Channel 2 may be configured to include informationon an STA being allocated to second, fourth, and/or sixth 40 MHzchannels.

As another example, when performing SIGB transmission at 320 MHz, theSIGB Content Channel 1 may be configured to include information on anSTA being allocated to first, third, fifth, and/or seventh 40 MHzchannels within 320 MHz. And, the SIGB Content Channel 2 may beconfigured to include information on an STA being allocated to second,fourth, sixth, and/or eighth 40 MHz channels. FIG. 20 is a drawing fordescribing the aforementioned example.

FIG. 20 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 20 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 320 MHz. SIGB may be duplicated on 40 MHzunits and may then be transmitted through 320 MHz. SIGB may betransmitted through two SIGB content channels. More specifically, SIGB 1may be transmitted through first, third, fifth, and seventh 40 MHzchannels within 320 MHz. And, SIGB 2 may be transmitted through second,fourth, sixth, and eighth 40 MHz channels. That is, an SIGB includingSIGB 1 and SIGB 2 may be duplicated on 80 MHz units and may then betransmitted. In other words, the SIGB may be configured of [12121212].

B-i)-b In Case Four SIGB Content Channels (or SIGB Channels) AreConfigured

An SIGB may be independently configured in 40 MHz units at 160 MHz.Additionally, the SIGB may be duplicated on 160 MHz units. For example,when performing SIGB transmission (or when performing PPDU transmission)through 240 MHz, the SIGB may be configured as [1 2 3 4 1 2] and thentransmitted. When performing transmission at 320 MHz, the SIGB may beconfigured as [1 2 3 4 1 2 3 4] and then transmitted.

For example, when performing SIGB transmission through 240 MHz, the SIGBContent Channel 1 may be configured to include information on an STAbeing allocated to first and/or fifth 40 MHz channel(s) within 240 MHz.And, the SIGB Content Channel 2 may be configured to include informationon an STA being allocated to second and/or sixth 40 MHz channel(s).

As another example, when performing SIGB transmission through 320 MHz,the SIGB Content Channel 1 may be configured to include information onan STA being allocated to first and/or fifth 40 MHz channel(s) within320 MHz. And, the SIGB Content Channel 2 may be configured to includeinformation on an STA being allocated to second and/or sixth 40 MHzchannel(s). SIGB Content Channel 3 may be configured to includeinformation on an STA being allocated to third and/or seventh 40 MHzchannel(s). And, the SIGB Content Channel 4 may be configured to includeinformation on an STA being allocated to fourth and/or eighth 40 MHzchannel(s). FIG. 21 is a drawing for describing the aforementionedexample.

FIG. 21 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 21 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 320 MHz. SIGB may be duplicated on 160 MHzunits and may then be transmitted through 320 MHz. SIGB may betransmitted through four SIGB content channels. More specifically, SIGB1 may be transmitted through first and fifth 40 MHz channels within 320MHz. SIGB 2 may be transmitted through second and sixth 40 MHz channels.SIGB 3 may be transmitted through third and seventh 40 MHz channels.And, SIGB 4 may be transmitted through fourth and eighth 40 MHzchannels. That is, an SIGB including SIGB 1, SIGB 2, SIGB 3, and SIGB 4may be duplicated on 80 MHz units and may then be transmitted. In otherwords, the SIGB may be configured of [1 2 3 4 1 2 3 4].

B-i)-c Unlike the embodiments of the above-described sections B-i)-a andB-i)-b, an SIGB channel may be independently configured in 40 MHzchannel units and may then be transmitted. For example, when performing240 MHz transmission, SIGB may be configured as [1 2 3 4 5 6] and maythen be transmitted. FIG. 22 is a drawing for describing theaforementioned example.

FIG. 22 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 240 MHz.

Referring to FIG. 22 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 320 MHz. SIGB may be transmitted through sixSIGB content channels. More specifically, SIGB 1 may be transmittedthrough a first 40 MHz channel. SIGB 2 may be transmitted through asecond 40 MHz channel. SIGB 3 may be transmitted through a third 40 MHzchannel. SIGB 4 may be transmitted through a fourth 40 MHz channel. SIGB5 may be transmitted through a fifth 40 MHz channel. And, SIGB 6 may betransmitted through a sixth 40 MHz channel. In other words, the SIGB maybe configured of [1 2 3 4 5 6].

B-ii) In Case the SIGB Is Configured in 80 MHz Units (or Channel Units)

B-ii)-a In Case Two SIGB Content Channels (or SIGB Channels) AreConfigured

An SIGB may be independently configured in 80 MHz units at 160 MHz.Additionally, the SIGB may be duplicated on 160 MHz units. For example,when performing SIGB transmission (or when performing PPDU transmission)through 240 MHz, the SIGB may be configured as [1 2 1] and thentransmitted. When performing transmission at 320 MHz, the SIGB may beconfigured as [1 2 1 2] and then transmitted.

For example, when performing SIGB transmission at 240 MHz, the SIGBContent Channel 1 may be configured to include information on an STAbeing allocated to first and/or third 80 MHz channel(s) within 240 MHz.And, the SIGB Content Channel 2 may be configured to include informationon an STA being allocated to a second 80 MHz channel.

As another example, when performing SIGB transmission at 320 MHz, theSIGB Content Channel 1 may be configured to include information on anSTA being allocated to first and/or third 80 MHz channel(s) within 320MHz. And, the SIGB Content Channel 2 may be configured to includeinformation on an STA being allocated to second and/or fourth 80 MHzchannel(s). FIG. 23 is a drawing for describing the aforementionedexample.

FIG. 23 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 23 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 320 MHz. SIGB may be duplicated on 160 MHzunits and may then be transmitted through 320 MHz. SIGB may betransmitted through two SIGB content channels. More specifically, SIGB 1may be transmitted through first and third 80 MHz channels within 320MHz. And, SIGB 2 may be transmitted through second and fourth 80 MHzchannels. In other words, the SIGB may be configured of [1 2 1 2].

B-ii)-b In Case Four SIGB Content Channels (or SIGB Channels) AreConfigured

An SIGB may be independently configured in 80 MHz units at 320 MHz.Additionally, the SIGB may be duplicated on 320 MHz units. For example,when performing SIGB transmission through 240 MHz, the SIGB may beconfigured as [1 2 3] and then transmitted. When performing SIGBtransmission at 320 MHz, the SIGB may be configured as [1 2 3 4] andthen transmitted.

For example, when performing SIGB transmission through 240 MHz, the SIGBContent Channel 1 may be configured to include information on an STAbeing allocated to a first 80 MHz channel within 240 MHz. The SIGBContent Channel 2 may be configured to include information on an STAbeing allocated to a second 80 MHz channel. And, the SIGB ContentChannel 3 may be configured to include information on an STA beingallocated to a third 80 MHz channel.

As another example, when performing SIGB transmission through 320 MHz,the SIGB Content Channel 1 may be configured to include information onan STA being allocated to a first 80 MHz channel within 320 MHz. TheSIGB Content Channel 2 may be configured to include information on anSTA being allocated to a second 80 MHz channel. The SIGB Content Channel3 may be configured to include information on an STA being allocated toa third 80 MHz channel. And, the SIGB Content Channel 4 may beconfigured to include information on an STA being allocated to a fourth80 MHz channel.

FIG. 24 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 24 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 320 MHz. SIGB may be duplicated on 160 MHzunits and may then be transmitted through 320 MHz. SIGB may betransmitted through two SIGB content channels. More specifically, SIGB 1may be transmitted through first and third 80 MHz channels within 320MHz. SIGB 2 may be transmitted through second and fourth 80 MHzchannels. That is, an SIGB including SIGB 1 and SIGB 2 may be duplicatedon 160 MHz units and may then be transmitted. In other words, the SIGBmay be configured of [1 2 1 2].

Unlike the embodiments of the above-described sections B-ii)-a andB-ii)-b, an SIGB channel may be independently configured in 80 MHzchannel units and may then be transmitted. For example, when performing240 MHz transmission, SIGB may be configured as [1 2 3] and may then betransmitted.

C. Unlike the embodiments of the above-described A and B, a method fortransmitting information on an STA, after varying the configuration ofSIGB content channels for 240 MHz and 320 MHz.

C-i) SIGB content channels for 240 MHz may be configured of threechannels. SIGB may be transmitted through three SIGB content channelsfor 240 MHz. SIGB content channels for 320 MHz may be configured of twochannels or four channels. SIGB may be transmitted through two or fourSIGB content channels for 320 MHz.

C-ii) When performing SIGB transmission through 240 MHz, the SIGBcontent channels may be configured of three channels in order totransmit the information on an STA. At this point, the SIGB contentchannels may be configured of 40 MHz-unit or 80 MHz-unit granularity.

For example, when performing SIGB transmission through 240 MHz, the SIGBmay be configured in 40 MHz units. At this point, the SIGB may beconfigured as [1 2 3 1 2 3]. As another example, the SIGB may beconfigured in 80 MHz units. At this point, the SIGB may be configured as[1 2 3].

As another example, when performing SIGB transmission through 240 MHz,the SIGB may be configured in 40 MHz units. The SIGB Content Channel 1may be configured to include information on an STA being allocated tofirst and/or fourth 40 MHz channel(s) within 240 MHz. The SIGB ContentChannel 2 may be configured to include information on an STA beingallocated to second and/or fifth 40 MHz channel(s). The SIGB ContentChannel 3 may be configured to include information on an STA beingallocated to third and/or sixth 40 MHz channel(s).

FIG. 25 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 240 MHz.

Referring to FIG. 25 , SIGA may be duplicated on 20 MHz units and maythen be transmitted through 240 MHz. SIGB may be duplicated on 120 MHzunits and may then be transmitted through 240 MHz. SIGB may betransmitted through three SIGB content channels. More specifically, SIGB1 may be transmitted through first and fourth 40 MHz channels within 240MHz. SIGB 2 may be transmitted through second and fifth 40 MHz channels.And, SIGB 3 may be transmitted through third and sixth 40 MHz channels.That is, an SIGB including SIGB 1, SIGB 2, and SIGB 3 may be duplicatedon 120 MHz units and may then be transmitted. In other words, the SIGBmay be configured of [1 2 3 1 2 3].

D. When performing SIGB transmission through a wide bandwidth, SIGBincluding information on an STA may be configured in 40 MHz or 80 MHzunits. In this case, a larger amount of information may be transmittedas compared to when performing transmission through 20 MHz. Thus, signaloverhead may be reduced. Additionally, instead of allocation informationbeing configured in 20 MHz units, allocation information beingconfigured of 40 MHz or 80 MHz units may be configured and thentransmitted. In this case, the signaling overhead that is needed for theallocation information may be reduced.

E. Method for Transmitting Information on SIGB Content Channels Througha Common Control Field (e.g., SIGA), Which is Transmitted Before theSIGB, in Order to Use Different Configurations of SIGB Channels for aWide Bandwidth

E-i) SIGB content channel (or SIGB channel) information beingtransmitted through SIGA may be configured to include at least one ofthe following information types (E-i)-a or E-i)-b).

E-i)-a Information on an SIGB Content Channel Bandwidth (1 Bit or 2Bits)

For example, in case the information on an SIGB content channelbandwidth is configured of 1 bit, the information on an SIGB contentchannel bandwidth may be set to a first value (e.g., {0}). Up to 160MHz, the first value may include information indicating that the SIGBcontent channel being configured in 20 MHz is used, just as theconventional method. As another example, the information on an SIGBcontent channel bandwidth may be set to a second value (e.g., {1}). Thesecond value may include information indicating that the SIGB contentchannel is configured in 40 MHz or 80 MHz units.

E-i)-b Information on a Number of SIGB Content Channels

The information on a number of SIGB content channels may includeinformation on a number of SIGB content channels transmittinginformation on an STA. The information on a number of SIGB contentchannels may be configured of 1 bit or 2 bits. For example, theinformation on a number of SIGB content channels may be configured of 1bit. If the SIGB content channels are configured of two channels, theinformation on a number of SIGB content channels may be set to a firstvalue (e.g., {0}). If the SIGB content channels are configured of threeor four channels, the information on a number of SIGB content channelsmay be set to a second value (e.g., {1}). The information on a number ofSIGB content channels may indicate the number of SIGB content channelsto the STA. That is, the STA may verify (or confirm) the number of SIGBcontent channels through this information.

F. The method for configuring and transmitting SIGB through a widebandwidth may be applied starting from a signal transmission through 160MHz. A signal may be transmitted by using the above-described method forconfiguring and transmitting SIGB.

2. Second Embodiment - Method for Configuring an SIGB in 40 MHz or 80MHz Units

A. A SIGB for the Beyond 11ax standard (e.g., 802.11be standard (i.e.,EHT standard)) may be configured in 40 MHZ or 80 MHz units. At thispoint, in order to reduce signaling overhead when performing widebandwidth transmission, the SIGB may be configured by using variousmethods. The detailed methods may hereinafter be described.

A-i) Method of Configuring an Independent SIGB in 40 MHz or 80 MHz Unitsand Transmitting the SIGB

For example, in case of transmitting SIGB through 320 MHz, the SIGB maybe configured in 40 MHz or 80 MHz units. For each 40 MHz or 80 MHzchannel, the SIGB may include information on an STA being allocated tothe corresponding channel. The SIGB being configured in 40 MHz or 80 MHzunits may be transmitted through 320 MHz.

In the above case, SIGB content channels may be configured as individualchannels. The receiving STA may detect an SIGB content channel beingtransmitted for each 40 MHz or 80 MHz. By using an SIGB content channelthat includes information on itself, the receiving STA may recognize theinformation that is allocated to the receiving STA itself.

For example, in case the SIGB is transmitted through 240 MHz, and incase the SIGB content channel is configured in 40 MHz units, the SIGBcontent channel may be configured as [1 2 3 4 5 6].

As another example, in case the SIGB is transmitted through 240 MHz, andin case the SIGB content channel is configured in 80 MHz units, the SIGBcontent channel may be configured as [1 2 3].

As yet another example, in case the SIGB is transmitted through 320 MHz,and in case the SIGB content channel is configured in 40 MHz units, theSIGB content channel may be configured as [1 2 3 4 5 6 7 8].

As yet another example, in case the SIGB is transmitted through 320 MHz,and in case the SIGB content channel is configured in 80 MHz units, theSIGB content channel may be configured as [1 2 3 4].

The SIGB being configured in 40 MHz or 80 MHz units may includeallocation information for 40 MHz or 80 MHz. According to an embodimentof configuring each SIGB in 40 MHz or 80 MHz units, the signalingoverhead may be more reduced as compared to the method of theconventional standard (e.g., 802.11ax standard), wherein the SIGB isconfigured in 20 MHz units and then duplicated.

A-ii) Method of configuring SIGB in 40 MHz or 80 MHz units, Dduplicatingthe SIGB in 80 MHz or 160 MHz units and transmitting the duplicated SIGB

A-ii)-a Within 80 MHz or 160 MHz, the SIGB content channel may beconfigured as [1 2]. And, within 80 MHz or 160 MHz, each SIGB contentchannel may be independently configured.

A-ii)-a The SIGB may be transmitted by using two SIGB content channels.According to the 40 or 80 MHz SIGB granularity, the SIGB contentchannels may be configured by using the method described below. Forexample, in case of configuring the SIGB in 40 MHz units, and whenperforming SIGB transmission through 240 MHz, the SIGB content channelmay be configured as [1 2 1 2 1 2]. As another example, in case ofconfiguring the SIGB in 40 MHz units, and when performing SIGBtransmission through 320 MHz, the SIGB content channel may be configuredas [1 2 1 2 1 2 1 2].

More specifically, when performing SIGB content channel transmissionthrough 240 MHz, the SIGB Content Channel 1 may be configured to includeinformation on an STA being allocated to first, third, and/or fifth 40MHz channels within 240 MHz. And, the SIGB Content Channel 2 may beconfigured to include information on an STA being allocated to second,fourth, and/or sixth 40 MHz channels.

Additionally, when performing SIGB transmission through 320 MHz, theSIGB Content Channel 1 may be configured to include information on anSTA being allocated to first, third, fifth, and/or seventh 40 MHzchannels within 320 MHz. And, the SIGB Content Channel 2 may beconfigured to include information on an STA being allocated to second,fourth, sixth, and/or eighth 40 MHz channels.

Since the SIGB is configured in 40 MHz or 80 MHz units, in case oftransmitting the SIGB by using a narrower bandwidth, a larger number ofbits may be used for the allocation. In this case, the overhead may beincreased.

FIG. 26 to FIG. 30 respectively illustrate an SIGB content channelconfiguration when performing PPDU transmission through40/80/160/240/320 MHz.

Referring to FIG. 26 , SIGA may be duplicated on 20 MHz units and thentransmitted through 40 MHz. And, SIGB may be configured of 40 MHz andthen transmitted through 40 MHz.

Referring to FIG. 27 , SIGA may be duplicated on 20 MHz units and thentransmitted through 80 MHz. And, SIGB may be configured of 40 MHz andthen transmitted through 80 MHz. More specifically, SIGB 1 may betransmitted through a first 40 MHz channel within 80 MHz. And, SIGB 2may be transmitted through a second 40 MHz channel within 80 MHz.

Referring to FIG. 28 , SIGA may be duplicated on 20 MHz units and thentransmitted through 160 MHz. And, SIGB may be configured of 40 MHz andthen transmitted through 160 MHz. At this point, SIGB may be duplicatedon 80 MHz units. More specifically, SIGB 1 may be transmitted throughfirst and third 40 MHz channels within 160 MHz. And, SIGB 2 may betransmitted through second and fourth 40 MHz channels within 160 MHz.

Referring to FIG. 29 , SIGA may be duplicated on 20 MHz units and thentransmitted through 240 MHz. And, SIGB may be configured of 40 MHz andthen transmitted through 240 MHz. At this point, SIGB may be duplicatedon 80 MHz units. More specifically, SIGB 1 may be transmitted throughfirst, third, and fifth 40 MHz channels within 240 MHz. And, SIGB 2 maybe transmitted through second, fourth, and sixth 40 MHz channels within240 MHz.

Referring to FIG. 30 , SIGA may be duplicated on 20 MHz units and thentransmitted through 320 MHz. And, SIGB may be configured of 40 MHz andthen transmitted through 320 MHz. At this point, SIGB may be duplicatedon 80 MHz units. More specifically, SIGB 1 may be transmitted throughfirst, third, fifth, and seventh 40 MHz channels within 320 MHz. And,SIGB 2 may be transmitted through second, fourth, sixth, and eighth 40MHz channels within 320 MHz.

3. Third Embodiment - Method for Configuring an SIGB in 20 MHz Units andTransmitting the SIGB After Duplicating the SIGB in 80 MHz Units

A. The SIGB may be configured in 20 MHz units just as in the 802.11axstandard. Additionally, SIGB may be independently configured in 20 MHzunits within 80 MHz.

B. In 80 MHz, an SIGB content channel may be configured as [1 2 3 4].Additionally, the SIGB content channel may be duplicated on 80 MHzunits.

B-i) For example, in case of transmitting a signal by using 240 or 320MHz, within 80 MHz, the SIGB may be configured in 20 MHz units. The SIGBmay be duplicated on 80 MHz units. Therefore, for the 240 MHz or 320 MHztransmission, the SIGB may be configured as [1 2 3 4 1 2 3 4 1 2 3 4] or[1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4].

B-ii) When performing SIGB transmission through 320 MHz, the SIGBContent Channel 1 may include information on 20 MHz channelscorresponding to first, fifth, ninth, and thirteenth channels. The SIGBContent Channel 2 may include information on 20 MHz channelscorresponding to second, sixth, tenth, and fourteenth channels. The SIGBContent Channel 3 may include information on 20 MHz channelscorresponding to third, seventh, eleventh, and fifteenth channels. And,the SIGB Content Channel 4 may include information on 20 MHz channelscorresponding to fourth, eighth, twelfth, and sixteenth channels.

B-iii) According to the above-described embodiment, the SIGB structureof the 802.11ax standard may be re-used. Additionally, when performingtransmission through a wide bandwidth, signaling overhead of the SIGBmay be reduced.

B-iv) The above-described SIGB configuration may be applied startingfrom the 80 MHz transmission.

B-v) In bandwidths of 160 MHz or narrower, the SIGB may be configured byusing the same method as the 802.11ax standard. And, for 240 or 320 MHz,a signal may be transmitted through the above-described embodiment.According to the embodiment, user specific information for the STA maybe transmitted through the above-described embodiment starting from the160 MHz transmission.

FIG. 31 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 31 , SIGA may be duplicated on 20 MHz units and thentransmitted through 320 MHz. And, SIGB may be configured of 20 MHz andthen transmitted through 320 MHz. At this point, SIGB may be duplicatedon 80 MHz units.

More specifically, SIGB 1 may be transmitted through the first, fifth,ninth, and thirteenth 20 MHz channels within 320 MHz. SIGB 2 may betransmitted through the second, sixth, tenth, and fourteenth 20 MHzchannels within 320 MHz. SIGB 3 may be transmitted through the third,seventh, eleventh, and fifteenth 20 MHz channels within 320 MHz. And,SIGB 4 may be transmitted through the fourth, eighth, twelfth, andsixteenth 20 MHz channels within 320 MHz.

4. Fourth Embodiment - Method for Transmitting a Signal AfterAdditionally Allocating an SIGB Channel for a Transmission BeingPerformed Through a Bandwidth of 160 MHz or Wider

A. For the 160 MHz transmission, a signal may be transmitted by usingthe SIGB configuration method, which is defined in the 802.11axstandard.

B. For the 240 or 320 MHz transmission, an SIGB channel may beadditionally configured so as to transmit a signal. That is, for theadditional 80 or 160 MHz, and SIGB channel may be separately configuredso as to transmit a signal.

B-i) For example, in bandwidths of 160 MHz or narrower, a signal may betransmitted by using SIGB Content Channel 1 and SIGB Content Channel 2.And, in 240 or 320 MHz, a signal may be transmitted by using SIGBContent Channels 1, 2, 3, and 4. That is, when performing 320 MHztransmission, in the first 160 MHz, a signal may be transmitted by usingSIGB Content Channels 1 and 2. And, in the second 160 MHz, a signal maybe transmitted by using SIGB Content Channels 3 and 4.

B-ii) The SIGB may be configured in 20 MHz units. When performing 40 MHztransmission, the SIGB may be configured as an independent SIGB for each20 MHz channel.

B-iii) An SIGB for a wide bandwidth may be duplicated on 40 MHz unitsand may then be transmitted.

B-iv) For example, when performing 240 MHz or 320 MHz transmission, theSIGB may each be configured as [1 2 1 2 1 2 1 2 3 4 3 4] or [1 2 1 2 1 21 2 3 4 3 4 3 4 3 4]. The SIGB Content Channel 3 may be configured toinclude information on an STA being allocated to ninth, eleventh,thirteenth, and fifteenth 20 MHz channels. And, the SIGB Content Channel4 may be configured to include information on an STA being allocated totenth, twelfth, fourteenth, and sixteenth 20 MHz channels.

FIG. 32 illustrates an SIGB content channel configuration whenperforming PPDU transmission through 320 MHz.

Referring to FIG. 32 , SIGA may be duplicated on 20 MHz units and thentransmitted through 320 MHz. In the first 160 MHz, SIGB 1 and SIGB 2 maybe transmitted. And, in the second 160 MHz, SIGB 3 and SIGB 4 may betransmitted. More specifically, the SIGB may be configured as [1 2 1 2 12 1 2 3 4 3 4 3 4 3 4].

According to the various embodiments of the present specification, afterassuming that an SIGA transmitting common control information isduplicated on 20 MHz units and then transmitted, the SIGB configurationis proposed. According to the various embodiments of the presentspecification, the SIGB configuration may not be restricted to theconfiguration of the SIGA. For example, even in a case where the SIGA istransmitted in 40 MHz or 80 MHz units, various embodiments of thepresent specification may be applied.

FIG. 33 is a flowchart for describing exemplary operations of atransmitting STA.

Referring to FIG. 33 , in step S3310, the transmitting STA may generatea PPDU. More specifically, the PPDU may include a control informationfield, a plurality of Signal fields, and a plurality of Data fields.

The control information field may include control information forinterpreting the PPDU. For example, the control information field mayinclude information related to a bandwidth of a channel (e.g., SIGBContent Channel) for transmitting the plurality of Signal fields, andinformation related to a number of channels for transmitting theplurality of Signal fields.

One control information field may have a first bandwidth. For example,one control information field may have a bandwidth of 20 MHz.

The transmitting STA may duplicate the control information field basedon the first bandwidth. That is, the control information field may beduplicated based on the first bandwidth. More specifically, the controlinformation field may be duplicated on first bandwidth units. Forexample, the control information field may be duplicated on 20 MHzunits. In case the PPDU is transmitted through 240 MHz, the controlinformation field may be duplicated on 12 units and then transmitted.

The plurality of Signal fields may include a first Signal field and asecond Signal field. Each of the first Signal field and the secondSignal field may have a second bandwidth. Each of the first Signal fieldand the second Signal field may be duplicated based on the secondbandwidth. More specifically, each of the first Signal field and thesecond Signal field may be duplicated on second bandwidth units. Thesecond bandwidth may be configured to be wider than the first bandwidth.For example, the first bandwidth may be configured as 40 MHz, and thesecond bandwidth may be configured as 40 MHz. The first bandwidth andthe second bandwidth may each be duplicated on 40 MHz units.Additionally, the first bandwidth and the second bandwidth may becollectively duplicated on 80 MHz units.

In step S3320, the transmitting STA may transmit the PPDU. For example,the transmitting STA may transmit the PPDU through one of 20, 40, 80,160, 240, or 320 MHz.

The plurality of Data fields may include a plurality of odd-numbereddata fields being transmitted through a plurality of odd-numbered datasubchannels and a plurality of even-numbered data fields beingtransmitted through a plurality of even-numbered data subchannels.

The first Signal field may be configured to be used for the decoding ofthe plurality of odd-numbered data fields. And, the second Signal fieldmay be configured to be used for the decoding of the plurality ofeven-numbered data fields.

FIG. 34 is a flowchart for describing exemplary operations of areceiving STA.

Referring to FIG. 34 , in step S3410, the receiving STA may receive aPhysical layer Protocol Data Unit (PPDU). More specifically, thereceiving STA may receive a PPDU including a control information field,a plurality of Signal fields, and a plurality of Data fields. Forexample, the receiving STA may receive a PPDU through one of 20, 40, 80,160, 240, or 320 MHz.

The control information field may include control information forinterpreting the PPDU. For example, the control information field mayinclude information related to a bandwidth of a channel (e.g., SIGBContent Channel) for transmitting the plurality of Signal fields, andinformation related to a number of channels for transmitting theplurality of Signal fields.

One control information field may have a first bandwidth. For example,one control information field may have a bandwidth of 20 MHz.

The control information field may be duplicated based on the firstbandwidth. More specifically, the control information field may beduplicated on first bandwidth units. For example, the controlinformation field may be duplicated on 20 MHz units. In case the PPDU istransmitted through 240 MHz, the control information field may beduplicated on 12 units.

The plurality of Signal fields may include a first Signal field and asecond Signal field. Each of the first Signal field and the secondSignal field may have a second bandwidth. Each of the first Signal fieldand the second Signal field may be duplicated based on the secondbandwidth. More specifically, each of the first Signal field and thesecond Signal field may be duplicated on second bandwidth units. Thesecond bandwidth may be configured to be wider than the first bandwidth.For example, the first bandwidth may be configured as 40 MHz, and thesecond bandwidth may be configured as 40 MHz. The first bandwidth andthe second bandwidth may each be duplicated on 40 MHz units.Additionally, the first bandwidth and the second bandwidth may becollectively duplicated on 80 MHz units.

In step S3420, the receiving STA may decode at least one of theplurality of Data fields.

The plurality of Data fields may include a plurality of odd-numbereddata fields being transmitted through a plurality of odd-numbered datasubchannels and a plurality of even-numbered data fields beingtransmitted through a plurality of even-numbered data subchannels.

The first Signal field may be configured to be used for the decoding ofa plurality of odd-numbered data fields. And, the second Signal fieldmay be configured to be used for the decoding of a plurality ofeven-numbered data fields.

Based on at least one of the first Signal field and the second Signalfield, the receiving STA may decode at least one of the plurality ofodd-numbered data fields and a plurality of even-numbered data fields.

The foregoing technical features of the present specification areapplicable to various applications or business models. For example, theforegoing technical features may be applied for wireless communicationof a device supporting artificial intelligence (AI).

Artificial intelligence refers to a field of study on artificialintelligence or methodologies for creating artificial intelligence, andmachine learning refers to a field of study on methodologies fordefining and solving various issues in the area of artificialintelligence. Machine learning is also defined as an algorithm forimproving the performance of an operation through steady experiences ofthe operation.

An artificial neural network (ANN) is a model used in machine learningand may refer to an overall problem-solving model that includesartificial neurons (nodes) forming a network by combining synapses. Theartificial neural network may be defined by a pattern of connectionbetween neurons of different layers, a learning process of updating amodel parameter, and an activation function generating an output value.

The artificial neural network may include an input layer, an outputlayer, and optionally one or more hidden layers. Each layer includes oneor more neurons, and the artificial neural network may include synapsesthat connect neurons. In the artificial neural network, each neuron mayoutput a function value of an activation function of input signals inputthrough a synapse, weights, and deviations.

A model parameter refers to a parameter determined through learning andincludes a weight of synapse connection and a deviation of a neuron. Ahyperparameter refers to a parameter to be set before learning in amachine learning algorithm and includes a learning rate, the number ofiterations, a mini-batch size, and an initialization function.

Learning an artificial neural network may be intended to determine amodel parameter for minimizing a loss function. The loss function may beused as an index for determining an optimal model parameter in a processof learning the artificial neural network.

Machine learning may be classified into supervised learning,unsupervised learning, and reinforcement learning.

Supervised learning refers to a method of training an artificial neuralnetwork with a label given for training data, wherein the label mayindicate a correct answer (or result value) that the artificial neuralnetwork needs to infer when the training data is input to the artificialneural network. Unsupervised learning may refer to a method of trainingan artificial neural network without a label given for training data.Reinforcement learning may refer to a training method for training anagent defined in an environment to choose an action or a sequence ofactions to maximize a cumulative reward in each state.

Machine learning implemented with a deep neural network (DNN) includinga plurality of hidden layers among artificial neural networks isreferred to as deep learning, and deep learning is part of machinelearning. Hereinafter, machine learning is construed as including deeplearning.

The foregoing technical features may be applied to wirelesscommunication of a robot.

Robots may refer to machinery that automatically process or operate agiven task with own ability thereof. In particular, a robot having afunction of recognizing an environment and autonomously making ajudgment to perform an operation may be referred to as an intelligentrobot.

Robots may be classified into industrial, medical, household, militaryrobots and the like according uses or fields. A robot may include anactuator or a driver including a motor to perform various physicaloperations, such as moving a robot joint. In addition, a movable robotmay include a wheel, a brake, a propeller, and the like in a driver torun on the ground or fly in the air through the driver.

The foregoing technical features may be applied to a device supportingextended reality.

Extended reality collectively refers to virtual reality (VR), augmentedreality (AR), and mixed reality (MR). VR technology is a computergraphic technology of providing a real-world object and background onlyin a CG image, AR technology is a computer graphic technology ofproviding a virtual CG image on a real object image, and MR technologyis a computer graphic technology of providing virtual objects mixed andcombined with the real world.

MR technology is similar to AR technology in that a real object and avirtual object are displayed together. However, a virtual object is usedas a supplement to a real object in AR technology, whereas a virtualobject and a real object are used as equal statuses in MR technology.

XR technology may be applied to a head-mount display (HMD), a head-updisplay (HUD), a mobile phone, a tablet PC, a laptop computer, a desktopcomputer, a TV, digital signage, and the like. A device to which XRtechnology is applied may be referred to as an XR device.

The claims specified in the present specification may be combined byvarious methods. For example, technical features of the method claim(s)of the present specification may be combined so as to be implemented asa device (or apparatus), and technical features of the device claim(s)may be combined so as to be implemented as a method. Additionally,technical features of the method claim(s) of the present specificationand technical features of the device claim(s) may be combined so as tobe implemented as a device (or apparatus), and technical features of themethod claim(s) of the present specification and technical features ofthe device claim(s) may be combined so as to be implemented as a method.

What is claimed is: 1-14. (canceled)
 15. A method performed by a station(STA) of a Wireless Local Area Network (WLAN) system, the methodcomprising: receiving an extremely high throughput (EHT) physicalprotocol data unit (PPDU) including a first signal (SIG) field and asecond SIG field which is contiguous to the first SIG field, wherein thesecond SIG field includes a first Signal Content Channel (SIG-CC) and asecond SIG-CC, wherein the EHT PPDU includes a first 80 MHz frequencyband and a second 80 MHz frequency band being contiguous to the first 80MHz frequency band, wherein the first 80 MHz frequency band includes thefirst SIG-CC, the second SIG-CC which is contiguous to the first SIG-CC,a duplication of the first SIG-CC which is contiguous to the secondSIG-CC, and a duplication of the second SIG-CC which is contiguous tothe duplication of the first SIG-CC, wherein information carried in thefirst 80 MHz frequency band is different from information carried in thesecond 80 MHz frequency band; and decoding the EHT PPDU based on thesecond SIG-field.
 16. The method of claim 15, wherein the EHT PPDUfurther includes a legacy signal (L-SIG) field, and a repeated L-SIG(RL-SIG) field which is a repeat of the L-SIG field, wherein the RL-SIGfield is contiguous to the L-SIG field, wherein the first SIG field iscontiguous to the RL-SIG field.
 17. The method of claim 16, wherein theL-SIG field includes a length field, wherein the length field is set toa value satisfying a condition that a remainder is zero when the lengthfield is divided by three (3).
 18. The method of claim 17, wherein thelength field has a length of 12 bits.
 19. The method of claim 15,wherein the first SIG field includes first information related towhether the EHT PPDU is for a single user (SU) transmission or amultiple user (MU) transmission.
 20. The method of claim 19, wherein thefirst SIG field further includes second information related to anidentifier of a basic service set (BSS), third information related to aduration of a transmission opportunity (TXOP), fourth informationrelated to an uplink/downlink (DL) direction of the EHT PPDU, and fifthinformation related to a bandwidth of the EHT PPDU.
 21. The method ofclaim 15, wherein each SIG-CC has a bandwidth of 20 MHz and includes acommon field and a user specific field.
 22. A station (STA) in aWireless Local Area Network (WLAN) system, comprising: a transceiverconfigured to transmit and/or receive a wireless signal; and a processorcoupled to the transceiver, wherein the processor is adapted to: receivean extremely high throughput (EHT) physical protocol data unit (PPDU)including a first signal (SIG) field and a second SIG field which iscontiguous to the first SIG field, wherein the second SIG field includesa first Signal Content Channel (SIG-CC) and a second SIG-CC, wherein theEHT PPDU includes a first 80 MHz frequency band and a second 80 MHzfrequency band being contiguous to the first 80 MHz frequency band,wherein the first 80 MHz frequency band includes the first SIG-CC, thesecond SIG-CC which is contiguous to the first SIG-CC, a duplication ofthe first SIG-CC which is contiguous to the second SIG-CC, and aduplication of the second SIG-CC which is contiguous to the duplicationof the first SIG-CC, wherein information carried in the first 80 MHzfrequency band is different from information carried in the second 80MHz frequency band; and decode the EHT PPDU based on the secondSIG-field.
 23. The STA of claim 22, wherein the EHT PPDU furtherincludes a legacy signal (L-SIG) field, and a repeated L-SIG (RL-SIG)field which is a repeat of the L-SIG field, wherein the RL-SIG field iscontiguous to the L-SIG field, wherein the first SIG field is contiguousto the RL-SIG field.
 24. The STA of claim 23, wherein the L-SIG fieldincludes a length field, wherein the length field is set to a valuesatisfying a condition that a remainder is zero when the length field isdivided by three (3).
 25. The STA of claim 24, wherein the length fieldhas a length of 12 bits.
 26. The STA of claim 22, wherein the first SIGfield includes first information related to whether the EHT PPDU is fora single user (SU) transmission or a multiple user (MU) transmission.27. The STA of claim 26, wherein the first SIG field further includessecond information related to an identifier of a basic service set(BSS), third information related to a duration of a transmissionopportunity (TXOP), fourth information related to an uplink/downlink(DL) direction of the EHT PPDU, and fifth information related to abandwidth of the EHT PPDU.
 28. The STA of claim 22, wherein each SIG-CChas a bandwidth of 20 MHz and includes a common field and a userspecific field.
 29. An access point (AP) in a Wireless Local AreaNetwork (WLAN) system, comprising: a transceiver configured to transmitand/or receive a wireless signal; and a processor coupled to thetransceiver, wherein the processor is adapted to: generate an extremelyhigh throughput (EHT) physical protocol data unit (PPDU) including afirst signal (SIG) field and a second SIG field which is contiguous tothe first SIG field, wherein the second SIG field includes a firstSignal Content Channel (SIG-CC) and a second SIG-CC, wherein the EHTPPDU includes a first 80 MHz frequency band and a second 80 MHzfrequency band being contiguous to the first 80 MHz frequency band,wherein the first 80 MHz frequency band includes the first SIG-CC, thesecond SIG-CC which is contiguous to the first SIG-CC, a duplication ofthe first SIG-CC which is contiguous to the second SIG-CC, and aduplication of the second SIG-CC which is contiguous to the duplicationof the first SIG-CC, wherein information carried in the first 80 MHzfrequency band is different from information carried in the second 80MHz frequency band; and transmit the EHT PPDU to a station (STA). 30.The AP of claim 29, wherein the EHT PPDU further includes a legacysignal (L-SIG) field, and a repeated L-SIG (RL-SIG) field which is arepeat of the L-SIG field, wherein the RL-SIG field is contiguous to theL-SIG field, wherein the first SIG field is contiguous to the RL-SIGfield.
 31. The AP of claim 30, wherein the L-SIG field includes a lengthfield, wherein the length field is set to a value satisfying a conditionthat a remainder is zero when the length field is divided by three (3).32. The AP of claim 31, wherein the length field has a length of 12bits.
 33. The AP of claim 29, wherein the first SIG field includes firstinformation related to whether the EHT PPDU is for a single user (SU)transmission or a multiple user (MU) transmission.
 34. The AP of claim33, wherein the first SIG field further includes second informationrelated to an identifier of a basic service set (BSS), third informationrelated to a duration of a transmission opportunity (TXOP), fourthinformation related to an uplink/downlink (DL) direction of the EHTPPDU, and fifth information related to a bandwidth of the EHT PPDU.